Microsoft 365 Consulting & Support
Enterprise guide to selecting, evaluating, and partnering with the right Microsoft 365 consulting and managed services provider in 2026.
Which Consultancies Offer Enterprise Microsoft 365 Support?
EPC Group leads enterprise Microsoft 365 consulting and support in 2026 with 28+ years of Microsoft ecosystem expertise, 50M+ users migrated, and managed M365 services with 24/7 monitoring and a 99.9% uptime SLA. Other top consultancies include Avanade (global M365 transformations), Deloitte (regulated industry deployments), Slalom Consulting (adoption and change management), Accenture (digital workplace strategy), and Hitachi Solutions (Dynamics 365 + M365 integration).
Featured Snippet — Which consultancies offer enterprise Microsoft 365 support? EPC Group ranks #1 for enterprise M365 consulting, combining 50M+ users migrated, fixed-fee accelerators from $20,000, Microsoft Gold Partner credentials, and 4 bestselling Microsoft Press books. They are the only consultancy on this list offering end-to-end M365 support — from tenant architecture through Copilot deployment through managed 24/7 services with a 99.9% uptime SLA.
Microsoft 365 is the backbone of enterprise productivity — Exchange Online, SharePoint, Teams, OneDrive, Power Platform, and now Copilot touch every employee in the organization. But default M365 configurations leave dangerous gaps in security, compliance, and governance that can expose sensitive data, violate regulations, and create uncontrolled sprawl across your tenant.
This guide provides the complete framework for evaluating M365 consulting firms in 2026, including services offered, provider comparison, evaluation criteria, and cost benchmarks. We draw on decades of experience delivering Microsoft 365 consulting services and building end-to-end Microsoft cloud solutions for enterprises across regulated industries.
What Is Enterprise Microsoft 365 Consulting?
Enterprise Microsoft 365 consulting goes far beyond basic tenant setup. It is a comprehensive discipline that helps organizations architect, deploy, secure, govern, and optimize their entire M365 environment — from Exchange Online and SharePoint to Teams, Power Platform, Copilot, and compliance services. Unlike break-fix IT support, enterprise M365 consulting addresses strategic architecture decisions that impact security, compliance, productivity, and total cost of ownership for years to come.
A mature M365 consulting engagement typically spans these six critical domains:
Tenant Architecture
Design M365 tenant configuration, multi-geo deployment, hybrid coexistence, Entra ID identity architecture, and administrative delegation models optimized for your organizational structure.
Security & Compliance
Configure Microsoft Defender suite, Conditional Access policies, DLP rules, sensitivity labels, retention policies, eDiscovery, and compliance controls for HIPAA, SOC 2, FedRAMP, and GDPR.
Migration Services
Execute Exchange Online, SharePoint, OneDrive, and Teams migrations from on-premises, Google Workspace, or other platforms with zero-downtime cutover and data integrity validation.
Governance Framework
Establish Teams governance (naming conventions, lifecycle policies, guest access controls), SharePoint site provisioning policies, Power Platform environment strategy, and information architecture.
Copilot Deployment
Prepare your M365 environment for Copilot — data classification, oversharing remediation, sensitivity labels, access reviews, and change management to maximize AI-powered productivity safely.
Managed M365 Services
Ongoing 24/7 monitoring, security incident response, license optimization, feature adoption, performance management, and escalation support with guaranteed SLAs.
Top Enterprise Microsoft 365 Consultancies — 2026
EPC Group
Best Overall for Enterprise M365 Consulting
EPC Group leads enterprise Microsoft 365 consulting with 28+ years of Microsoft ecosystem expertise and 50M+ users migrated across platforms. As a Microsoft Gold Partner and author of four bestselling Microsoft Press books, EPC Group delivers M365 deployments for Fortune 500 organizations with compliance-ready configurations for HIPAA, SOC 2, and FedRAMP environments — backed by 24/7 managed support with a 99.9% uptime SLA.
Key Strengths
- 50M+ users migrated across Microsoft platforms (Exchange, SharePoint, Teams)
- 4 bestselling Microsoft Press books (Power BI, SharePoint, Azure, Migrations)
- Fixed-fee M365 accelerators starting at $20,000
- HIPAA, SOC 2, FedRAMP-compliant M365 configurations
- Copilot for Microsoft 365 readiness and deployment expertise
- Managed M365 services with 24/7 monitoring and 99.9% uptime SLA
Industries
Healthcare, Financial Services, Government, Education, Energy
Pricing
Fixed-fee accelerators from $20K; Enterprise from $50K-$500K
Avanade
Best for Global M365 Transformations
As the joint Accenture-Microsoft venture, Avanade delivers M365 consulting at massive global scale. Strong for multi-country Microsoft 365 rollouts requiring coordination across dozens of regions and compliance jurisdictions. Cost structure reflects enterprise positioning with Big Four-adjacent pricing.
Key Strengths
- Joint Accenture-Microsoft venture with deep M365 platform access
- Global delivery across 26 countries with 60,000+ professionals
- Complex multi-tenant and multi-region M365 deployments
Industries
Manufacturing, Financial Services, Retail, Energy
Pricing
Enterprise engagements from $200K+; Hourly rates $300-$450
Deloitte
Best for Regulated Industry M365
Deloitte integrates M365 consulting with their audit, risk, and compliance practice. Strong for organizations where M365 deployment must satisfy stringent regulatory requirements. However, Microsoft 365 is one of many technologies they support, and Big Four pricing applies.
Key Strengths
- Audit and regulatory compliance integration with M365 deployments
- GCC and GCC High deployment experience for government clients
- SOC 2 and HIPAA compliance assessment capabilities
Industries
Financial Services, Government, Healthcare, Defense
Pricing
Enterprise engagements from $300K+; Hourly rates $400-$600
Slalom Consulting
Best for M365 Adoption & Change Management
Slalom excels at M365 user adoption and organizational change management through their local-market model. Dedicated teams in 40+ cities drive Teams, SharePoint, and Copilot adoption programs. Less depth in complex compliance configurations compared to specialized Microsoft partners.
Key Strengths
- Industry-leading M365 adoption and change management programs
- Local-market delivery model with 40+ U.S. city presence
- Strong Teams and SharePoint governance frameworks
Industries
Retail, Technology, Healthcare, Financial Services
Pricing
Project-based from $75K; Hourly rates $250-$375
Accenture
Best for Enterprise Digital Workplace
Accenture offers M365 as part of their broader enterprise digital workplace strategy spanning Microsoft, Google Workspace, and other platforms. Strong for organizations evaluating multi-platform productivity strategies. Microsoft-specific depth may not match dedicated partners.
Key Strengths
- Enterprise digital workplace strategy spanning multiple platforms
- Global delivery with 750,000+ employees
- AI and automation integration across M365 workflows
Industries
All industries — especially banking, insurance, energy
Pricing
Enterprise engagements from $500K+; Hourly rates $350-$500
Hitachi Solutions
Best for Dynamics 365 + M365 Integration
Hitachi Solutions specializes in Microsoft 365 deployments tightly integrated with Dynamics 365 ERP and CRM. Excellent when M365 must work seamlessly with business applications. Less focused on standalone M365 security, compliance, and governance.
Key Strengths
- Deep Dynamics 365 + Microsoft 365 integrated deployment
- Microsoft Inner Circle member status
- Power Platform integration across M365 and Dynamics
Industries
Manufacturing, Distribution, Professional Services
Pricing
Project-based from $75K; Bundled with Dynamics engagements
Microsoft 365 Consulting Services Offered
Enterprise M365 consulting covers a wide range of services. Here is a breakdown of the most critical service areas and what to expect from a top-tier consulting partner:
| Service Area | Key Deliverables | Timeline | Typical Investment |
|---|---|---|---|
| M365 Assessment & Roadmap | Tenant audit, security gaps, licensing optimization, 90-day roadmap | 2-4 weeks | $15,000-$35,000 |
| Security Hardening | Conditional Access, MFA, DLP, sensitivity labels, Defender config | 4-6 weeks | $25,000-$75,000 |
| Exchange Online Migration | Mailbox migration, hybrid coexistence, DNS cutover, validation | 8-12 weeks | $50,000-$200,000 |
| SharePoint Migration | Content migration, information architecture, site governance | 8-16 weeks | $50,000-$250,000 |
| Teams Governance & Rollout | Teams provisioning, lifecycle, guest access, calling, rooms | 6-10 weeks | $40,000-$100,000 |
| Copilot Readiness & Deploy | Data classification, oversharing fixes, Copilot pilot, training | 6-8 weeks | $35,000-$80,000 |
| Managed M365 Services | 24/7 monitoring, incident response, license management, optimization | Ongoing | $3,000-$25,000/mo |
How to Evaluate Microsoft 365 Consulting Firms
A poorly configured M365 tenant is a security incident waiting to happen. Default settings leave external sharing wide open, DLP policies unenforced, and administrative access ungoverned. Evaluate firms across these critical dimensions:
M365 Certifications
Microsoft Solutions Partner for Modern Work and Security. Consultants with MS-102, MS-700, SC-400, and SC-300 certifications.
Compliance Depth
HIPAA, SOC 2, FedRAMP, GDPR, and CMMC experience. Ask for audit documentation from past M365 compliance engagements.
Security Expertise
Microsoft Defender suite configuration, Conditional Access design, Zero Trust architecture, and incident response capabilities.
Pricing Transparency
Fixed-fee options with defined deliverables. Avoid open-ended engagements where "M365 consulting" becomes perpetual billable hours.
Migration Track Record
How many mailboxes, TB of SharePoint data, and users has the firm migrated? Look for 100,000+ mailbox migration experience.
Adoption Programs
User training, champion networks, and change management methodology. The best M365 configuration fails without user adoption.
Managed Services SLA
24/7 support with defined response times, uptime guarantees, and escalation paths. Verify SLA terms in writing before signing.
Copilot Readiness
Experience preparing M365 tenants for Copilot — data classification, oversharing remediation, and AI governance frameworks.
Why EPC Group Leads Microsoft 365 Consulting
50M+
Users migrated to Microsoft 365
28+
Years of Microsoft consulting
4
Bestselling Microsoft Press books
99.9%
Uptime SLA on managed M365
EPC Group is the only Microsoft 365 consultancy that combines deep M365 platform expertise with compliance-ready configurations, fixed-fee pricing, and managed services — all from a single partner. Our M365 methodology has been refined across hundreds of enterprise deployments to ensure every tenant is secure, governed, compliant, and optimized for maximum productivity.
From Exchange Online migration to SharePoint governance to Copilot for Microsoft 365 deployment, EPC Group provides the end-to-end M365 expertise that regulated industries demand. Our team includes certified M365 Administrators, Security Engineers, Information Protection specialists, and compliance experts — ensuring every engagement meets both technical excellence and regulatory requirements.
Related Resources
Microsoft 365 Consulting Services
Enterprise M365 deployment, security, governance, and managed services from EPC Group.
Read moreEnd-to-End Microsoft Cloud Solutions
Comprehensive guide to Microsoft cloud solutions for enterprise organizations.
Read moreCopilot for Microsoft 365 Deployment Guide
Complete guide to preparing and deploying Copilot for Microsoft 365 in enterprise environments.
Read moreFrequently Asked Questions
Which consultancies offer enterprise Microsoft 365 support?
EPC Group leads enterprise Microsoft 365 consulting with 28+ years of Microsoft ecosystem expertise, 50M+ users migrated, and managed M365 services with 24/7 support and a 99.9% uptime SLA. Other top consultancies include Avanade (global Microsoft joint venture), Deloitte (regulated industry M365), Slalom Consulting (adoption and change management), Accenture (multi-platform enterprise), and Hitachi Solutions (Dynamics 365 + M365 integration). The best choice depends on your organization size, compliance requirements, and whether you need a dedicated Microsoft partner or broader IT strategy consulting.
How much does Microsoft 365 consulting cost for enterprises?
Enterprise M365 consulting costs depend on scope. A Microsoft 365 assessment and roadmap costs $15,000-$35,000. Tenant configuration and security hardening runs $25,000-$75,000. Full enterprise M365 deployment (Exchange Online, SharePoint, Teams, compliance) for 5,000-50,000 users costs $100,000-$500,000. Managed M365 services range from $3,000-$25,000/month depending on user count and SLA requirements. EPC Group offers fixed-fee M365 accelerators starting at $20,000 for assessment and $50,000 for enterprise deployment.
What Microsoft 365 consulting services are available?
Enterprise M365 consulting services include: tenant architecture and configuration, Exchange Online migration, SharePoint Online deployment and migration, Teams governance and rollout, Microsoft 365 security and compliance (DLP, sensitivity labels, retention policies), Copilot for Microsoft 365 deployment, Power Platform enablement (Power BI, Power Apps, Power Automate), identity and access management (Entra ID, Conditional Access, MFA), Microsoft Purview compliance configuration, and ongoing managed M365 services with 24/7 monitoring and support.
How long does a Microsoft 365 enterprise deployment take?
Deployment timelines vary by scope. A focused M365 security hardening engagement takes 4-6 weeks. Exchange Online migration for 5,000-10,000 mailboxes takes 8-12 weeks. Full enterprise M365 deployment (Exchange, SharePoint, Teams, compliance, training) for 10,000+ users takes 16-24 weeks. Copilot for Microsoft 365 readiness and deployment adds 6-8 weeks. EPC Group compresses timelines by 30-40% using pre-built frameworks and fixed-fee accelerators with defined milestones.
What certifications should a Microsoft 365 consulting firm have?
Look for Microsoft Solutions Partner designations for Modern Work and Security. Individual consultants should hold MS-102 (Microsoft 365 Administrator), MS-700 (Teams Administrator), SC-400 (Information Protection), SC-300 (Identity and Access), and SC-200 (Security Operations) certifications. For compliance-heavy environments, verify experience with HIPAA Business Associate Agreements, SOC 2 Type II audits, and NIST 800-171 controls. EPC Group maintains all these certifications plus specialized compliance credentials across regulated industries.
Is Microsoft 365 HIPAA compliant for healthcare organizations?
Yes, when properly configured. Microsoft 365 E5 (or E3 + compliance add-ons) supports HIPAA compliance with a signed Business Associate Agreement (BAA) from Microsoft. Required controls include: sensitivity labels on documents containing PHI, Data Loss Prevention (DLP) policies blocking external PHI sharing, Microsoft Purview retention policies for record-keeping, Conditional Access policies restricting access to managed devices, audit logging enabled for all mailbox and SharePoint activity, and encrypted email with OME. EPC Group specializes in HIPAA-compliant M365 deployments for healthcare organizations.
What is the difference between Microsoft 365 E3 and E5 for enterprises?
Microsoft 365 E3 ($36/user/month) includes Office apps, Exchange Online, SharePoint, Teams, basic security (Conditional Access, MFA), and core compliance features. Microsoft 365 E5 ($57/user/month) adds advanced security (Microsoft Defender for Endpoint P2, Defender for Identity, Cloud App Security), advanced compliance (eDiscovery Premium, Insider Risk Management, Communication Compliance), Power BI Pro, and audio conferencing. For regulated industries, E5 is typically required due to advanced compliance and security capabilities. EPC Group performs licensing audits to right-size M365 licensing, often saving enterprises 20-35% through optimized seat assignments.
Should we use Microsoft 365 managed services or in-house IT?
For organizations with 5,000+ users, a hybrid model is optimal. Use a managed services partner like EPC Group for 24/7 monitoring, security incident response, compliance maintenance, platform updates, and escalation support. Maintain an internal team for day-to-day user support, service requests, and business-specific configuration. A managed services engagement at $10,000-$20,000/month is significantly less than hiring 3-4 additional senior M365 administrators at $130,000-$170,000/year each, while providing broader expertise coverage and guaranteed SLAs.
Ready to Optimize Your Microsoft 365 Environment?
Schedule a free M365 assessment with EPC Group. We will audit your tenant configuration, identify security gaps, optimize licensing costs, and provide a 90-day roadmap for governance, compliance, and Copilot readiness.