Skip to main content
Microsoft Solutions Partner — Security · 11,000+ engagements

Microsoft Defender XDR — Extended Detection & Response (2026)

The unified Microsoft XDR — Endpoint, Office 365, Cloud Apps, Identity, and Vulnerability Management fused into a single incident graph. Delivered by a senior-architect-led Microsoft Solutions Partner founded in 1997.

Book a Defender XDR briefingCall 888-381-9725
What is Microsoft Defender XDR and how do enterprises deploy it across Endpoint, Office 365, Cloud Apps, Identity, and Vulnerability Management? Microsoft Defender XDR (formerly Microsoft 365 Defender) is the unified Microsoft Extended Detection and Response platform fusing Defender for Endpoint (MDE), Defender for Office 365 (MDO), Defender for Cloud Apps (MDCA, the Microsoft CASB), Defender for Identity (MDI, the on-premises AD ITDR), and Defender Vulnerability Management (MDVM) into a single incident graph with cross-domain correlation, automated investigation and response (AIR), and Microsoft Security Copilot acceleration. Enterprises deploy it through a five-phase Assess, Deploy, Correlate, Copilot, Operate program that licenses through Microsoft 365 E5 or M365 E5 Security, sequences per-workload activation, tunes AIR action thresholds, and integrates bidirectionally with Microsoft Sentinel, Microsoft Purview, and Microsoft Entra for unified SOC investigation.

Microsoft Defender XDR fuses MDE (endpoint), MDO (Office 365), MDCA (CASB), MDI (on-prem AD ITDR), and MDVM (vulnerability management) into a single incident graph with cross-domain correlation, AIR, and Security Copilot. For M365 E5 customers, the bundled value plus integrated CASB and ITDR planes deliver 30 to 55 percent year-one savings versus a CrowdStrike + Proofpoint + Netskope + Semperis multi-vendor stack. EPC Group delivers the full XDR under a fixed-fee five-phase accelerator between $200K and $800K.

Key Facts

  • Defender XDR rebranded from Microsoft 365 Defender mid-2023 to reflect expanded Defender for Cloud and Sentinel correlation
  • Five workloads compose XDR: MDE, MDO, MDCA, MDI, MDVM
  • M365 E5 Security ($12/user/month list) is the path of least resistance above 2,000 seats
  • Cross-domain correlation fuses every alert into a single incident graph with shared entity inventory
  • AIR runs scoped remediation when the configured confidence threshold is met
  • Security Copilot accelerates investigation — summarization, KQL generation, remediation proposals
  • Bidirectional integration with Sentinel, Purview Insider Risk, and Entra ID Protection
  • Microsoft Solutions Partner founded in 1997, 70+ Fortune 500 clients, 216+ M&A tenant consolidations
  • Five-phase XDR Accelerator — 12 to 22 weeks, fixed-fee $200K to $800K

The five Defender XDR workloads — what each protects and what each surfaces

Defender XDR is one product surface composed of five purchasable workloads — MDE, MDO, MDCA, MDI, MDVM — that together cover the endpoint, email and collaboration, SaaS, on- premises identity, and vulnerability planes. Understanding each workload is the first step toward a defensible Microsoft consolidation case.

MDE

Microsoft Defender for Endpoint

Protects: Windows, macOS, Linux, iOS, and Android endpoints — the EDR plane covering every device that touches a corporate identity, application, or data set.

  • Behavioral EDR with the Microsoft cloud-delivered threat intelligence graph
  • Next-gen antivirus with cloud protection, ASR rules, and tamper protection
  • Automated investigation and remediation — file quarantine, process kill, registry rollback
  • Plan 1 vs Plan 2 — P2 adds EDR, AIR, advanced hunting KQL, and Threat Experts
  • Live Response remote shell with PowerShell, Bash, and file-system access

Advanced Hunting Signal: DeviceEvents, DeviceFileEvents, DeviceProcessEvents, DeviceNetworkEvents, DeviceLogonEvents.

MDO

Microsoft Defender for Office 365

Protects: The Exchange Online, SharePoint Online, OneDrive, and Microsoft Teams attack surface — every inbound email, link, attachment, and external Teams chat.

  • Safe Attachments detonation in Microsoft cloud sandboxes before delivery
  • Safe Links time-of-click URL detonation across email, Teams, and Office
  • Anti-phishing impersonation protection with mailbox intelligence
  • Plan 1 vs Plan 2 — P2 adds Threat Explorer, Attack Simulation Training, AIR, Threat Trackers
  • Campaign view that clusters related phishing across thousands of mailboxes into one incident

Advanced Hunting Signal: EmailEvents, EmailAttachmentInfo, EmailUrlInfo, UrlClickEvents.

MDCA

Microsoft Defender for Cloud Apps (CASB)

Protects: SaaS application traffic, OAuth app risk, shadow IT discovery, and session-level controls across thousands of cloud applications — the CASB tier of XDR.

  • Cloud Discovery — 31,000+ SaaS app catalog with risk scoring fed by MDE, firewall, and SWG logs
  • OAuth app governance — risk-score every consented app in the Entra tenant, including AI agents and Power Platform connectors
  • Connectors for Microsoft 365, Salesforce, Workday, Box, Dropbox, ServiceNow, Google Workspace, AWS, Okta
  • Conditional Access App Control session policies — block download, watermark, or step-up auth at the session layer
  • Purview label enforcement inside SaaS apps and anomaly detection (impossible travel, mass download, ransomware)

Advanced Hunting Signal: CloudAppEvents table — every SaaS app activity surfaces here in advanced hunting.

MDI

Microsoft Defender for Identity

Protects: Active Directory Domain Services, ADCS, and ADFS — the hybrid identity attack surface and ITDR (Identity Threat Detection and Response) plane.

  • Sensor on every domain controller, ADCS server, and ADFS server — parses Windows events, ETW, and traffic locally
  • Detection of Golden Ticket, Silver Ticket, Pass-the-Hash, Pass-the-Ticket, DCSync, DCShadow, AS-REP roasting
  • Lateral movement path graph — which compromised non-admin accounts can reach Tier 0
  • Identity posture assessments — unsecure settings, Kerberos delegation, legacy auth
  • Action accounts that automate disable-user and reset-password remediation from the Defender portal

Advanced Hunting Signal: IdentityLogonEvents, IdentityQueryEvents, IdentityDirectoryEvents, IdentityInfo.

MDVM

Microsoft Defender Vulnerability Management

Protects: Software inventory, CVE exposure, security baseline drift, browser extensions, and firmware on every MDE-covered device plus network-discovered unmanaged devices.

  • Continuous vulnerability assessment across Windows, macOS, Linux, iOS, Android, and network devices
  • Exposure score and Microsoft Secure Score for Devices rolled up by group and CVE
  • Baseline assessment against CIS Benchmarks, STIG, and Microsoft Security Baselines
  • Authenticated network scanner finds unmanaged servers and switches without an MDE sensor
  • Vulnerability prioritization tied to active exploits and real-world exploitation telemetry

Advanced Hunting Signal: DeviceTvmSoftwareInventory, DeviceTvmSoftwareVulnerabilities, DeviceTvmSecureConfigurationAssessment.

Cross-domain fusion

Cross-domain attack correlation — the XDR difference

Endpoint detection alone is not XDR. The defining capability is cross-domain correlation — fusing alerts across the endpoint, email, SaaS, identity, and vulnerability planes into a single incident graph that an analyst can walk forward and backward without writing a query.

Kill chain visualization — incident graph fusion

The Defender XDR incident graph fuses every alert across MDE, MDO, MDCA, MDI, and MDVM into one incident node with edges drawn to every user, device, mailbox, file, IP, URL, OAuth app, and on-prem identity entity touched. Analysts walk the graph forward and backward without writing a KQL query — the practical reason a Microsoft-anchored tier-one analyst investigates a cross-domain incident in the time a tier-three engineer needs on a non-XDR platform.

Automated investigation and response (AIR)

AIR is the playbook engine that auto-investigates every incident and runs scoped remediation when confidence passes the configured threshold. For an email-borne threat, AIR follows the URL through Safe Links, identifies every other recipient who received the campaign, evaluates clicks, examines endpoint activity, and produces a recommendation. EPC Group tunes AIR thresholds — full-auto for file quarantine, semi-auto for endpoint isolation, manual-review for global admin disable.

Advanced hunting — unified KQL across every domain

Advanced hunting is one KQL surface joining EmailEvents, DeviceProcessEvents, IdentityLogonEvents, CloudAppEvents, and AlertInfo into a single schema. A SOC engineer hunts cross-domain — "every device where the user clicked a phishing link, then triggered a suspicious process within 60 minutes" — in one query. The EPC Group SOC ships a library of 200+ pre-built queries mapped to MITRE ATT&CK, deployed as Defender XDR custom detection rules where appropriate.

Unified incident timeline and entity inventory

Every incident carries a timeline of every alert, comment, remediation action, and entity touched. Entity inventory tracks devices, users, IPs, URLs, files, and mailboxes as first-class objects with risk scores. Closing the incident closes every underlying alert; the post-incident report exports as auditor-ready evidence — critical for HIPAA breach reporting, SEC cybersecurity disclosure, and FedRAMP continuous monitoring.

Six enterprise Defender XDR patterns we ship

The XDR product is general-purpose. The deployment patterns are what convert it into measurable outcomes. These six are the patterns EPC Group ships across the F500 customer base — each grounded in a specific incident scenario and a specific cross-workload correlation.

BEC and phishing investigation — MDO + MDCA + MDE

Scenario: A phishing email lands, the user clicks a Safe Links URL, credentials harvest to an attacker domain, the attacker signs into Microsoft 365 from a foreign IP, sets a mailbox forwarding rule, and exfiltrates contacts from OneDrive. MDO flags the phishing email, MDCA flags the impossible-travel sign-in and forwarding rule, MDE flags the credential entry on the user device, and Defender XDR fuses all signals into a single incident with a unified timeline.

EPC Group outcome: EPC Group ships standardized BEC runbooks — auto-quarantine the email, revoke active Entra sessions, disable forwarding via Graph API, isolate the endpoint via MDE Live Response. Mean time to contain on the runbook is under 15 minutes.

Ransomware lateral movement — MDE + MDI + MDVM

Scenario: Initial access through an unpatched VPN appliance MDVM had flagged as a critical CVE. Attacker drops Cobalt Strike (MDE detects), runs DCSync against the domain controller (MDI detects), then attempts lateral movement using stolen credentials. The MDI lateral movement path graph had already flagged the compromised account as reachable to Tier 0 — the posture finding becomes the root cause.

EPC Group outcome: AIR playbooks isolate the endpoint, disable the user through MDI action accounts, force credential rotation through Entra, and hand off to a Sentinel SOAR playbook. The combined MDE + MDI + MDVM signal stops ransomware before file servers are touched in 80 percent of EPC Group red-team simulations on the platform.

Supply chain compromise — MDE + MDCA + MDVM + MDO

Scenario: A SaaS vendor consumed by 12,000 employees through OAuth SSO is breached. Attacker uses the compromised consent to read mailbox data, and a malicious npm package enters the CI/CD pipeline. MDCA flags the OAuth app risk score change, MDVM flags the npm package in software inventory, MDO flags suspicious forwarding tied to the app, and MDE flags the package on developer endpoints.

EPC Group outcome: EPC Group ships an OAuth app governance baseline that pre-blocks high-risk consent patterns, runs weekly OAuth risk reviews in MDCA, integrates MDVM with the customer SBOM, and configures custom detection rules that fire when MDVM finds a known-malicious package on an endpoint with CI/CD pipeline access.

Insider risk and data exfiltration — MDCA + MDE + Microsoft Purview

Scenario: A departing employee downloads sensitive engineering files from SharePoint and uploads them to a personal cloud service. MDCA detects the mass download, MDE detects the upload to an unmanaged cloud, Microsoft Purview Insider Risk correlates with the resignation event, and Defender XDR fuses all three signals into a single insider-risk incident.

EPC Group outcome: EPC Group integrates Defender XDR with Purview Insider Risk policies, configures MDCA Conditional Access App Control session policies that block download to unmanaged devices, and ships automated response that revokes the Entra session and triggers a legal-hold workflow in Purview eDiscovery.

AKS container runtime threat — MDE + Defender for Cloud bidirectional XDR

Scenario: A vulnerable container image pulls to AKS, executes a privilege escalation, mounts the node file system, drops a crypto-miner, and beacons out. Defender for Cloud detects the container runtime threat, the underlying AKS node MDE sensor detects the malicious process at the kernel layer, and Defender XDR correlates the container-level and node-level signals into one incident with image lineage attached.

EPC Group outcome: EPC Group configures the bidirectional Defender for Cloud and Defender XDR integration so AKS runtime alerts surface as XDR incidents and endpoint alerts on AKS nodes return to Defender for Cloud attack path analysis. See the EPC Group Defender for Cloud CNAPP hub for the workload-side configuration.

M&A tenant consolidation and cross-tenant XDR

Scenario: A Fortune 500 acquirer integrates a Fortune 1000 target post-close. The target carries a separate Microsoft 365 tenant with its own Defender XDR. SOC teams need cross-tenant visibility during the 9-to-18-month tenant migration window — but two separate XDR portals exist without configuration.

EPC Group outcome: EPC Group configures Microsoft 365 multi-tenant organization (MTO) and the Defender XDR multi-tenant view (GA 2024) so analysts see consolidated incidents across both tenants in one portal. Acquired-tenant MDE, MDO, MDCA, MDI, and MDVM signal all surface alongside the acquirer. EPC Group has executed this pattern across 200+ M&A engagements and is the dominant U.S. practice for Microsoft-anchored post-close security integration.

XDR + CNAPP loop

Defender XDR plus Defender for Cloud — the CWPP closure

Defender XDR covers the user-facing security plane. Microsoft Defender for Cloud — the separate CNAPP — covers the workload plane across Azure, AWS, and GCP (VMs, containers, databases, storage, app services, APIs, Key Vault, Resource Manager, DNS). The bidirectional integration closes the workload-protection loop.

Server CWPP via MDE entitlement

Defender for Servers Plan 1 and Plan 2 bundle the MDE license, so every cloud workload server gets EDR coverage feeding the Defender XDR incident graph without separate MDE licensing.

Container runtime fusion

AKS, EKS, and GKE container runtime alerts from Defender for Containers surface inside the same Defender XDR incident as the underlying MDE node-level signal — one incident, container plus node plus image lineage.

Database, storage, API correlation

Defender for Databases, Storage, and APIs alerts surface as Defender XDR incidents when the user identity tied to the cloud workload activity is in scope — closing the user-to-workload investigation loop.

For the dedicated CNAPP workload-protection hub, see Microsoft Defender for Cloud CNAPP Enterprise Guide (2026).

AI-accelerated SOC

Microsoft Security Copilot inside Defender XDR

Microsoft Security Copilot is the generative-AI investigation layer inside the Defender XDR portal. Licensed by Security Compute Unit (SCU) capacity and embedded in the incident view, the advanced hunting editor, and the report drafter.

Investigation acceleration

Security Copilot reads the entire incident — every alert, entity, and comment — and produces a one-paragraph executive summary, a tier-three technical narrative, and a remediation playbook. EPC Group measures the tier-one mean-time-to-triage drop at 40 to 60 percent across SOC teams in production for at least 90 days.

Natural-language KQL generation

Advanced hunting accepts natural-language prompts — “every device where the user clicked a phishing link in 24 hours then triggered a suspicious PowerShell process” — and Security Copilot generates the joined KQL across EmailEvents + UrlClickEvents + DeviceProcessEvents. Role-based prompt libraries cover tier-one triage, tier-three hunting, and CISO board summaries.

License economics

License model — Microsoft 365 E5 vs M365 E5 Security vs standalone workloads

Defender XDR is licensed per user. Three practical paths — M365 E5 (bundled), M365 E5 Security (standalone add-on to E3), or per-workload standalone SKUs — drive 30 to 55 percent of year-one TCO.

M365 E5 (full bundle)

~$57 per user per month list. Includes M365 E3, Defender XDR (MDE P2, MDO P2, MDCA, MDI, MDVM add-on), Power BI Pro, Phone, Advanced Compliance. Justified on productivity and analytics; security bundled-in.

M365 E5 Security (add-on)

~$12 per user per month list as add-on to E3. Same Defender XDR feature set as E5. The path of least resistance for any enterprise above 2,000 seats running E3.

Standalone per-workload

MDE P1/P2, MDO P1/P2, MDCA, MDI, MDVM each licensed individually. Typically 20 to 40 percent higher than the E5 Security bundle at parity. Defensible under 500 seats or when only one or two workloads are in scope.

All prices are list and subject to Microsoft commercial change. EA and CSP discounts typically reduce list by 10 to 25 percent. License optimization is included in every EPC Group assessment phase. See our Microsoft 365 consulting practice for the underlying E3-to-E5-Security migration patterns.

Governance and compliance — XDR controls mapped to your regulatory reality

Defender XDR is the security-controls plane underneath HIPAA HITRUST, PCI-DSS 4.0, FedRAMP-authorized environments, CMMC Level 2, NIST CSF 2.0, ISO 27001, SOC 2, FFIEC, and GxP control families. Microsoft Defender for Endpoint, Microsoft Defender for Office 365, and Microsoft Defender for Cloud Apps are FedRAMP-authorized inside the GCC High Microsoft 365 cloud, making Defender XDR the practical EDR/XDR path for defense contractors and federal civilian agencies. EPC Group is FedRAMP-aligned and translates the Defender XDR signal into auditor-ready control evidence linked to the customer governance, risk, and compliance documentation. See our standards alignment library for the full mapping.

HIPAA
SOC 2
FedRAMP
FINRA
CMMC
GxP

The EPC Group Defender XDR Modernization Accelerator — five phases, fixed fee

The accelerator anchors on The EPC Group Lifecycle — Assess, Deploy, Correlate, Copilot, Operate. Fixed-scope between $200,000 and $800,000 depending on tenant scale, workload breadth, Security Copilot SCU footprint, and managed-service tail. Senior-architect led, no offshore handoff.

Phase 1 — Assess

XDR posture and license inventory in three weeks

A fixed-fee assessment that inventories every Defender workload license in the tenant, identifies the gap to M365 E5 Security or M365 E5, and produces a costed activation roadmap, MITRE ATT&CK coverage heatmap, and board-ready decision package contrasting Microsoft consolidation against the incumbent EDR, secure email gateway, CASB, and ITDR vendors.

  • Per-workload license inventory across MDE, MDO, MDCA, MDI, MDVM with E5 Security uplift quote
  • MITRE ATT&CK 14-tactic, 200+-technique coverage heatmap baselined against current stack
  • Defender XDR secure score baseline plus per-workload breakdown
  • Vendor consolidation business case — typical 30 to 55 percent year-one savings

Phase 2 — Deploy

Per-workload activation and baseline policies

Sensor and policy deployment across all five workloads, sequenced to prove value workload-by-workload and give the SOC controlled onboarding of each signal source before the next.

  • MDE sensor across Windows, macOS, Linux, iOS, Android via Intune and Configuration Manager
  • MDO preset security policy (Standard or Strict) with anti-phish, Safe Attachments, Safe Links
  • MDI sensor on every domain controller, ADCS server, and ADFS server
  • MDCA connectors for Microsoft 365 plus the top 10 third-party SaaS apps
  • MDVM continuous assessment with authenticated network scanner for unmanaged devices

Phase 3 — Correlate

AIR tuning, custom detection rules, Sentinel integration

Cross-domain correlation tuning that turns five workloads into a single XDR. EPC Group tunes AIR action thresholds per workload, deploys custom detection rules from the standardized hunting library, and integrates Defender XDR bidirectionally with Microsoft Sentinel.

  • AIR action-approval thresholds tuned per workload — full-auto, semi-auto, or manual review
  • Custom detection rules from the EPC Group hunting query library mapped to MITRE ATT&CK
  • Defender XDR bidirectional Sentinel integration through the native data connector
  • Tier-one SOC training on the unified incident graph and entity inventory workflows

Phase 4 — Copilot

Security Copilot acceleration and KQL generation

Activate Microsoft Security Copilot inside Defender XDR — incident summarization, natural-language KQL generation, incident report drafts, and remediation proposals. EPC Group ships role-based prompt libraries for tier-one triage, tier-three hunting, and CISO board summaries.

  • Security Copilot license provisioning and Security Compute Unit (SCU) capacity planning
  • Role-based prompt library deployment — tier-one, tier-three, and CISO prompts
  • Custom prompt templates for the customer incident response runbook portfolio
  • Natural-language KQL training so SOC analysts hunt from day one

Phase 5 — Operate

24/7 managed XDR with senior-architect escalation

Steady-state managed XDR — 24/7 monitoring of the Defender XDR incident queue, AIR exception adjudication, hunting library expansion, secure score uplift engineering across all five workloads, and quarterly Attack Simulation Training. Senior-architect escalation is the differentiator; every customer has named architects on call for the incidents that matter.

  • 24/7 SOC monitoring with bidirectional Sentinel correlation
  • Monthly secure score uplift engineering sprints
  • Quarterly attack simulation campaigns using MDO Attack Simulation Training
  • Custom detection rule library expansion — net-new rules shipped monthly

Why EPC Group leads enterprise Microsoft Defender XDR deployments

1997
Founded · Microsoft consulting
70+
Fortune 500 clients
216+
M&A tenant consolidations
1.83 million
Users migrated

Microsoft Solutions Partner — six designations

Microsoft Solutions Partner with the Security designation plus Modern Work, Infrastructure, Data & AI, Digital & App Innovation, and Business Applications. Senior architects average two decades of Microsoft platform delivery experience.

Four-time author for Microsoft Press and Sams

Founder Errin O’Connor has nearly three decades of Microsoft consulting leadership and is a four-time author for Microsoft Press and Sams across Power BI and SharePoint.

Fixed-fee XDR accelerators

Every Defender XDR engagement is fixed-fee with a costed roadmap and named senior architect on-record from kickoff through go-live. No T&M overruns, no offshore handoff, no junior-analyst-led production cutover.

Compliance-native

EPC Group is compliance-native across HIPAA, SOC 2, FedRAMP-aligned, FINRA, CMMC, and GxP. XDR deployments ship with auditor-ready control matrices, not generic Defender XDR screenshots.

Frequently asked questions — Microsoft Defender XDR

How does Microsoft Defender XDR compare to CrowdStrike Falcon XDR?

CrowdStrike Falcon XDR is the dominant pure-play EDR-anchored XDR. Strengths are the Falcon graph, agent maturity, and identity-correlation through Falcon Identity Protection. Weaknesses against Defender XDR for Microsoft-anchored enterprises: (1) Falcon XDR licenses on top of M365 E5 Security entitlements the customer already owns — typically $80 to $150 per user per year of duplicate spend; (2) lighter native Sentinel and Purview integration; (3) no integrated CASB plane comparable to MDCA inside the XDR portal. CrowdStrike wins for non-Microsoft estates or where Falcon was deployed before the M365 E5 decision. Defender XDR wins where the customer has M365 E5 and values the integrated CASB and ITDR planes inside one product surface.

How does Defender XDR compare to Palo Alto Cortex XDR?

Palo Alto Cortex XDR is the broadest-domain pure-play XDR — endpoint, network (via Palo Alto NGFW), cloud workload (via Prisma Cloud), and identity (Cortex ITDR). Strengths are network-side telemetry depth from the Palo Alto firewall install base and the Cortex XSIAM analytics maturity. Weaknesses against Defender XDR: (1) no native Microsoft 365 integration depth — MDO, MDCA, and MDI deliver SaaS, CASB, and ITDR coverage Cortex cannot match for Microsoft-first workloads; (2) cost premium typical of Palo Alto subscription stacks; (3) no M365 E5 bundle path. Cortex wins for heavy Palo Alto and Prisma Cloud estates. Defender XDR wins for the Microsoft 365 E5 customer base.

How does Defender XDR compare to SentinelOne Singularity XDR?

SentinelOne Singularity is the AI-anchored EDR/XDR platform built on autonomous response and the Storyline data model. Strengths are autonomous remediation maturity, Storyline visualization, and the Singularity Marketplace. Weaknesses against Defender XDR for Microsoft-anchored enterprises: (1) duplicate-license cost stack against M365 E5 Security; (2) lighter Sentinel, Purview, and Entra integration; (3) no CASB or ITDR plane inside the product surface. SentinelOne wins where the customer is already standardized on Singularity or runs a non-Microsoft 365 estate.

How does Defender XDR compare to Splunk Mission Control and Splunk Enterprise Security?

Splunk Mission Control and Splunk ES are SIEM-anchored security platforms with a layered XDR-style investigation surface on top. The comparison is asymmetric because Splunk does not ship native endpoint, email, identity, or CASB workloads — it ingests signal from third parties. The relevant comparison is Splunk ES plus a third-party EDR plus secure email gateway plus CASB plus ITDR vs Defender XDR plus Microsoft Sentinel. For M365 E5 customers the Defender XDR + Sentinel pattern delivers material savings and unified investigation that Splunk ES plus four point products cannot match. For non-Microsoft estates with deep Splunk investment, Splunk ES remains the right SIEM — see our Microsoft Sentinel hub for the Sentinel-vs-Splunk comparison.

What is the realistic license model and cost for Defender XDR?

Defender XDR is licensed per user through M365 E5, M365 E5 Security (the standalone add-on to E3), or per-workload standalone SKUs. For a typical 10,000-seat enterprise, M365 E5 Security runs approximately $144 per user per year ($12/user/month list, typically discounted in Enterprise Agreements). The standalone per-workload stack runs 20 to 40 percent higher than the bundle at full feature parity — which is why EPC Group recommends E5 Security as the path of least resistance for any customer above 2,000 seats. Microsoft 365 E5 (which adds Power BI Pro, Phone, and MDCA premium) runs approximately $57 per user per month list and is justified separately on productivity and analytics.

How does EPC Group deliver managed Defender XDR compared to traditional MSSPs?

Traditional MSSPs deliver Defender XDR through a tier-one offshore SOC with limited Microsoft platform engineering depth. The EPC Group delivery model is differentiated on three vectors: (1) senior-architect-led — every customer has named senior architects with 20+ years Microsoft platform experience on-call for the incidents and exception decisions that matter; (2) U.S.-based — no offshore handoff for engineering or exception adjudication; (3) compliance-native — auditor-ready evidence packs for HIPAA, SOC 2, FedRAMP-aligned, FFIEC, CMMC, and GxP ship standard. EPC Group has delivered Defender XDR (and its predecessor Microsoft 365 Defender) deployments across more than 70 Fortune 500 customers since platform general availability in 2020.

How does Defender XDR integrate with Microsoft Sentinel, Microsoft Purview, and Microsoft Entra?

Defender XDR integrates bidirectionally with Microsoft Sentinel through the native data connector — XDR incidents become Sentinel incidents and SOAR playbooks act on XDR entities. Microsoft Purview Insider Risk and DLP signal correlates into XDR incidents. Microsoft Entra ID Protection user-risk and sign-in-risk feeds XDR identity signal, and Conditional Access can act on the XDR user-risk score for step-up auth or session block. The four-product loop (XDR + Sentinel + Purview + Entra) is the Microsoft security platform reference architecture for F500 and the practical deployment pattern EPC Group ships across every managed engagement.

How does Microsoft Defender XDR relate to the former Microsoft 365 Defender brand?

Microsoft 365 Defender was rebranded to Microsoft Defender XDR in mid-2023 to reflect expanded scope beyond the original M365 attack surface — most importantly the integration with Microsoft Defender for Cloud (the CNAPP) and Microsoft Sentinel inside a unified Defender portal at security.microsoft.com. Every M365 Defender capability from 2022 is present in Defender XDR today, plus cross-portal incident correlation with Defender for Cloud and multi-tenant management capabilities released in 2024. Legacy M365 Defender names persist in PowerShell module names, audit log columns, and some admin center screens during the long-tail rename window.

Continue exploring the EPC Group enterprise Microsoft security library

Defender XDR is the user-facing security plane inside the broader Microsoft Cloud orchestration story. These hubs cover adjacent and complementary territory.

Microsoft Cloud Orchestrator

The end-to-end Microsoft cloud orchestration model under which XDR, CNAPP, SIEM, and identity all sit.

Microsoft Sentinel SIEM (2026)

The SIEM half of the Microsoft Defender platform. Bidirectional XDR integration, KQL libraries, and SOAR playbook patterns.

Microsoft Defender for Identity (ITDR) (2026)

The on-premises Active Directory ITDR plane that surfaces as the MDI workload inside Defender XDR.

Microsoft Defender for Cloud CNAPP (2026)

The workload-protection CNAPP that integrates bidirectionally with Defender XDR for cloud workload coverage.

Microsoft Entra ID (2026)

The cloud identity plane whose ID Protection user-risk signal feeds Defender XDR identity-side correlation.

Standards alignment library

NIST CSF 2.0, ISO 27001, HIPAA, FedRAMP, FINRA, CMMC, and GxP control mappings for Microsoft security platforms.

Microsoft 365 consulting services

The Microsoft 365 platform engineering practice underneath the E3-to-E5-Security license uplift that funds XDR consolidation.

30 to 55 percent year-one consolidation savings

Consolidate your security stack onto Microsoft Defender XDR

Book a Defender XDR briefing with an EPC Group senior architect. Two-hour working session — per-workload license inventory, MITRE ATT&CK coverage heatmap, vendor consolidation business case, accelerator scoping. Zero obligation, board-ready output.

Book the briefingCall 888-381-9725

HIPAA · SOC 2 · FedRAMP-aligned · FINRA · CMMC · GxP — auditor-ready control evidence ships standard.Senior-architect led from kickoff through go-live.

AI assistant — not human