Exchange & Email Migration
Enterprise email infrastructure led by senior Microsoft architects
EPC Group provides Exchange Server consulting and migration to Exchange Online (Microsoft 365). We handle on-premises Exchange administration, hybrid deployments, tenant-to-tenant migrations, and emergency support (requests accepted around the clock, acknowledged the same business day). Exchange Server 2019 reached end-of-life in October 2025 — contact us to plan your migration.
Key Facts
- Exchange Server 2019 end-of-life: October 2025.
- 3.7 million+ mailboxes migrated to Microsoft 365 by EPC Group.
- Managed Exchange Online support runs during business hours (Central); requests are accepted around the clock.
- Microsoft Solutions Partner — Modern Work designation.
- Exchange consulting since 1997. Founded 1997, Houston, TX.
Exchange Server & Microsoft 365 Email Services
Last updated by Errin O'Connor, Founder & Chief AI Architect, EPC Group
Enterprise-grade email migration and Exchange consulting backed by since 1997 of Microsoft expertise. From on-premises Exchange to hybrid and full cloud deployments with minimal-disruption migration.
Exchange & Email Migration Services
Complete email infrastructure services from assessment to migration to ongoing management
Exchange to Microsoft 365 Migration
Full migration from on-premises Exchange Server to Exchange Online with zero data loss and minimal user disruption.
- Cutover, staged, and hybrid migrations
- Exchange 2010, 2013, 2016, 2019 supported
- Public folders and shared mailboxes
Hybrid Exchange Deployment
Maintain on-premises Exchange while leveraging cloud capabilities. Ideal for compliance requirements and phased migrations.
- Unified GAL and free/busy sharing
- OAuth-based authentication
- Cross-premises eDiscovery
Email Security & Compliance
Enterprise email protection with advanced threat detection, DLP, and compliance configurations for regulated industries.
- Microsoft Defender for Office 365
- Data Loss Prevention (DLP) policies
- HIPAA, SOC 2, GDPR compliance
Third-Party Email Migration
Migrate from Gmail, Lotus Notes, GroupWise, Zimbra, and other email platforms to Microsoft 365.
- Google Workspace to Microsoft 365
- Lotus Notes/Domino migration
- IMAP mailbox migrations
Email Archiving & eDiscovery
Legal hold, compliance archiving, and eDiscovery solutions for regulatory requirements and litigation support.
- Microsoft Purview eDiscovery
- In-place and litigation holds
- Unlimited archive storage
Exchange Administration & Support
Ongoing Exchange management, monitoring, troubleshooting, and optimization services.
- Monitoring and alerting in business hours (Central)
- Performance optimization
- User provisioning automation
Why Choose EPC Group for Exchange Services
With Microsoft expertise since 1997 and thousands of successful email migrations, EPC Group delivers enterprise-grade Exchange solutions that minimize risk and maximize productivity.
Production-Safe Migration
Users continue working while we migrate their mailboxes in the background
100% Data Fidelity
All email, calendars, contacts, and permissions migrated without data loss
Compliance Expertise
HIPAA, SOC 2, FedRAMP, and GDPR compliance configurations
Fixed-Price Projects
Predictable costs with no hidden fees or scope creep
Migration Success Metrics
Industry-Specific Email Solutions
Healthcare
HIPAA-compliant email migration with encryption, BAA configuration, and PHI protection policies.
- • Message encryption for PHI
- • DLP policies for healthcare data
- • Audit logging for compliance
Financial Services
SOC 2 compliant email infrastructure with advanced security, archiving, and regulatory retention.
- • SEC/FINRA retention policies
- • Advanced threat protection
- • Customer key encryption
Government
FedRAMP-aligned consulting expertise Exchange Online with GCC/GCC High configurations for federal agencies.
- • FedRAMP High authorized
- • GCC and GCC High tenants
- • ITAR and CJIS compliance
Frequently Asked Questions
How long does an Exchange to Microsoft 365 migration take?
Migration timelines vary by organization size and complexity. Small organizations (under 500 users) typically complete in 2-4 weeks. Mid-size (500-5,000 users) takes 1-3 months. Enterprise migrations (5,000+ users) require 3-6 months with phased rollouts to minimize disruption.
Can we maintain a hybrid Exchange environment?
Yes, hybrid Exchange deployments allow you to maintain on-premises Exchange servers while using Exchange Online. This provides flexibility for compliance requirements, gradual migration, and specific workloads that must remain on-premises.
What happens to our email data during migration?
All email, calendar, contacts, and archive data are migrated with full fidelity. We use Microsoft-native tools and proven methodologies with documented data-fidelity checklists and full pre-cutover reconciliation. Users maintain continuous email access throughout the migration process.
Is Exchange Online HIPAA compliant?
Yes, Exchange Online (Microsoft 365) is HIPAA compliant when properly configured with a Business Associate Agreement (BAA). EPC Group specializes in healthcare compliance and ensures proper encryption, DLP policies, and audit logging are configured.
What is the cost of Exchange Online licensing?
Exchange Online Plan 1 starts at $4/user/month. Exchange Online Plan 2 with archiving and eDiscovery is $8/user/month. Most enterprises choose Microsoft 365 E3 (Microsoft list $39.00/user/month, annual commitment, with Teams; read 2026-10-21) or E5 (Microsoft list $60.00/user/month, same terms) for complete productivity suites.
Ready to Modernize Your Email Infrastructure?
Get a free Exchange migration assessment. Our experts will analyze your current environment and provide a detailed migration roadmap.
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Office 365 migration from Exchange
Methods, timeline, costs and the planning checklist for the move to Exchange Online
Exchange Server & Microsoft 365 Email Consulting
EPC Group offers consulting and migration services for Exchange Server to Exchange Online (Microsoft 365). We manage:
- On-premises Exchange administration
- Hybrid deployments
- Tenant-to-tenant migrations
- Emergency support, acknowledged the same business day
Exchange Server 2019 will reach end-of-life in October 2025. Contact us to plan your migration.
Exchange services
EPC Group covers the full Exchange Server and Exchange Online lifecycle.
- Exchange health assessment — audit current on-premises Exchange environment, identify migration blockers and risks.
- Migration to Exchange Online — cutover, staged, hybrid, or tenant-to-tenant migration with documented data-fidelity checklists and pre-cutover reconciliation.
- Hybrid Exchange — coexistence between on-premises Exchange and Exchange Online for phased migrations.
- Compliance configuration — retention policies, eDiscovery, litigation hold, DLP, and audit logging in Exchange Online.
- Emergency support — requests for mail flow failures, database corruption, and security incidents are accepted around the clock and acknowledged the same business day.
- Managed Exchange Online — ongoing administration, security monitoring, and quarterly compliance reviews.
Migration approaches
The right migration approach depends on your mailbox count and business requirements.
| Approach | Best for | Timeline |
|---|---|---|
| Cutover | Under 150 mailboxes | 1–2 weeks |
| Staged | 150–2,000 mailboxes | 4–8 weeks |
| Hybrid | 2,000+ mailboxes | 8–16 weeks |
| Tenant-to-tenant | M&A, divestiture | 4–12 weeks |
Why migrate from Exchange Server now?
Exchange Server 2019 is end-of-life as of October 2025. Running an unpatched mail server creates security and compliance risk.
- No new security patches from Microsoft for end-of-life Exchange versions.
- Compliance audit findings for HIPAA, SOC 2, and CMMC-subject organizations.
- Microsoft 365 Copilot requires Exchange Online mailboxes — on-premises Exchange is not supported.
- Ongoing infrastructure maintenance cost: hardware, OS, and Exchange licenses.
Exchange Online: key features
- Microsoft's 99.9% financially backed SLA.
- 50 GB per mailbox standard (unlimited archive with E3/E5).
- Microsoft Defender for Office 365 — anti-phishing, safe links, safe attachments.
- Microsoft Purview — retention policies, eDiscovery, compliance holds, audit logging.
- Microsoft 365 Copilot eligibility.
- Eliminates on-premises mail server hardware and maintenance costs.
Frequently asked questions
Is Exchange Server 2019 end-of-life?
Yes, Exchange Server 2019 reached its end-of-life in October 2025. After this date, Microsoft will stop releasing security updates.
Organizations that continue to run Exchange Server 2019 on-premises will be:
- Unpatched
- Exposed to security vulnerabilities
How many mailboxes has EPC Group migrated?
EPC Group has successfully migrated over 3.7 million mailboxes. These migrations include:
- On-premises Exchange to Microsoft 365
- Between Microsoft 365 tenants
We handle various migration scenarios, including cutover, staged, hybrid, and tenant-to-tenant migrations.
What is a hybrid Exchange deployment?
A hybrid Exchange deployment combines on-premises Exchange with Exchange Online. This setup allows users to be listed in a single Global Address List. It also ensures proper mail flow between both environments.
This approach is ideal for large enterprises that are migrating in phases over several months.
Does EPC Group support HIPAA-compliant Exchange Online?
Yes, EPC Group configures Exchange Online with a signed Microsoft BAA. We implement several key features to ensure compliance with HIPAA Security Rule requirements for electronic protected health information in email:
- DLP policies for PHI detection
- Sensitivity labels
- Retention holds
- Audit logging
Plan your Exchange migration
Talk to an EPC Group Exchange architect. Call (888) 381-9725 or request a 30-minute discovery call.