Exchange Consulting & Emergency Support
Migration services, hybrid deployments, and 24/7 emergency response for enterprise email infrastructure.
Founded 1997 · in our 30th year11,000+ enterprise engagementsMicrosoft Press bestselling author
Migration services, hybrid deployments, and 24/7 emergency response for enterprise email infrastructure.
By Errin O'Connor, Founder & Chief AI Architect, EPC Group
EPC Group provides Microsoft Exchange Server consulting, migration to Exchange Online (Microsoft 365), and 24/7 emergency support. Exchange Server 2019 reached end-of-life in October 2025. If you are still on-premises, now is the time to migrate. EPC Group has migrated 3.7 million+ mailboxes with a 5-day average cutover.
With the end-of-life for Exchange Server coming in October 2025, planning your migration strategy is essential. The move to subscription-based licensing is altering the cost structure of on-premises deployments.
EPC Group has successfully completed over 6,500 Exchange migrations for various enterprises, including:
Whether you're moving from on-premises Exchange to the cloud, consolidating tenants, or implementing a hybrid deployment, our certified engineers ensure a seamless transition.
Complete migration from Exchange Server 2013/2016/2019 to Exchange Online with documented data-fidelity checklists, pre-cutover reconciliation, and minimal downtime.
Maintain both on-premises and cloud mailboxes with seamless integration, shared calendars, and unified address book.
Upgrade legacy Exchange environments to supported versions before migrating to the cloud.
Migrate mailboxes between Microsoft 365 tenants during M&A, divestitures, or organizational restructuring.
When Exchange fails, your business stops. Our US-based Microsoft Certified Engineers are available around the clock to diagnose and resolve critical Exchange issues—remotely or on-site.
Exchange CU updates can fail catastrophically. Our engineers diagnose and resolve failed updates, corrupted installations, and rollback scenarios.
Mail not flowing? We troubleshoot and restore mail flow issues including connector problems, DNS misconfigurations, and transport rule conflicts.
Recover from database corruption, dismounted databases, and failed database availability groups. We restore service and recover lost data.
Respond to Exchange security breaches, compromised accounts, and zero-day vulnerabilities like ProxyLogon and ProxyShell.
Complete Exchange environment recovery from hardware failures, ransomware attacks, or catastrophic data loss scenarios.
Diagnose and resolve slow performance, high CPU utilization, memory pressure, and storage bottlenecks affecting Exchange.
Microsoft Certified Engineers • 15-Minute Response • 100% US-Based
From legacy Exchange 2010 to the latest Exchange Online, we've got you covered.
Microsoft has announced that Exchange Server 2016 and 2019 will reach the end of extended support in October 2025. Organizations using on-premises Exchange need to take action.
Note that the upgrade may involve cost increases of 10-20%.
Don't wait until October 2025. Our Exchange migration assessments identify risks, estimate timelines, and create a roadmap for a successful transition to Exchange Online.
EPC Group provides M365 deployment, migration, governance, security configuration, Copilot readiness, compliance setup, and managed services. We specialize in enterprise M365 environments with 1,000+ users requiring HIPAA, SOC 2, or FedRAMP compliance.
M365 consulting is scoped to the engagement: a focused migration, an enterprise governance and security implementation, or full platform optimization with Copilot. EPC Group offers fixed-price engagements.
Yes. EPC Group configures Microsoft 365 compliance features including retention policies, DLP, sensitivity labels, eDiscovery, communication compliance, and information barriers. We map these controls to specific frameworks: HIPAA, SOC 2, FedRAMP, GDPR, and CCPA.
EPC Group manages complex tenant-to-tenant migrations for M&A scenarios including mailbox migration, SharePoint content, Teams channels, OneDrive data, security groups, and conditional access policies. We use BitTitan, ShareGate, and custom PowerShell for seamless coexistence during transition.
EPC Group is a Microsoft consulting firm based in Houston. We have experience in enterprise implementation since 1997 and over 10,000 successful deployments. Our expertise includes:
We serve organizations in various sectors, including Fortune 500 companies, federal agencies, healthcare, financial services, government, manufacturing, energy, education, retail, technology, and global enterprises.
What sets EPC Group apart is our governance-first approach. Every engagement starts with a security and compliance assessment. Our senior architects have practical experience in:
We focus on delivering results, not just hours worked.
Call (888) 381-9725 or email contact@epcgroup.net for a free assessment.
EPC Group offers Microsoft Exchange Server consulting, migration to Exchange Online (Microsoft 365), and 24/7 emergency support.
Exchange Server 2019 will reach end-of-life in October 2025. If you are still using on-premises solutions, now is the time to migrate.
EPC Group covers the full Exchange lifecycle — from on-premises administration through migration to Exchange Online and post-migration managed services.
The right migration approach depends on mailbox count and business requirements. EPC Group selects and configures the appropriate method for each engagement.
| Approach | Mailbox count | Description | |---|---|---| | Cutover migration | Under 150 | All mailboxes migrate at once. Fastest method. | | Staged migration | 150–2,000 | Batches over weeks. On-premises Exchange remains active during migration. | | Hybrid migration | 2,000+ | Coexistence. Mailboxes move in waves. Best for large enterprises. | | Tenant-to-tenant | Any | Moves mailboxes between Microsoft 365 tenants. M&A and restructuring. | | IMAP migration | Any | For non-Exchange sources (Google Workspace, other mail systems). |Exchange Server 2019 reached end-of-life in October 2025. Microsoft no longer provides security patches or updates for end-of-life Exchange Server versions.
Running an unpatched mail server in 2026 creates serious risks:
Exchange Online is Microsoft 365's cloud-hosted email service. Moving from on-premises Exchange gives organizations:
Exchange Server 2019 reached its end-of-life in October 2025. Microsoft no longer offers security updates for this version. Organizations still using Exchange Server 2019 on-premises face risks from unpatched vulnerabilities.
These risks can lead to:
A cutover migration, which involves fewer than 150 mailboxes, typically takes 1 to 2 weeks.
A staged migration, for 150 to 2,000 mailboxes, usually requires 4 to 8 weeks.
For a hybrid migration in a large enterprise with over 2,000 mailboxes, the process can take 8 to 16 weeks and involves a phased rollout.
EPC Group migrates all mailbox data, including:
Litigation holds, retention policies, and compliance holds transfer correctly. Mail-enabled distribution groups and shared mailboxes also migrate.
A hybrid Exchange deployment combines on-premises Exchange with Exchange Online. This setup allows users to be included in one Global Address List. Additionally, mail can flow seamlessly between on-premises and cloud mailboxes.
This setup is perfect for large organizations with over 2,000 mailboxes. It supports a phased migration timeline.
Yes. EPC Group offers 30-day hypercare support following every migration. We also provide ongoing Exchange Online managed services for organizations that need:
Talk to an EPC Group Exchange architect. Call (888) 381-9725 or request a 30-minute discovery call.
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