Anonymized engagement summary: Exchange Server 2016 to Exchange Server 2019 migration with hybrid enablement for a community bank (2025)
Anonymized engagement summaryCommunity bank · 2025
Opening answer. In 2025 EPC Group was engaged by a community bank for a fixed-scope project: move the bank from Exchange Server 2016 to Exchange Server 2019 on its own VMware infrastructure, enable Microsoft 365 hybrid, and migrate about 200 active mailboxes (about 2 TB). The work was planned in five phases: environment readiness and hardening, build, migration and hybrid cut-over, documentation and knowledge transfer, and a short hypercare period. Banking regulatory requirements, cybersecurity and data privacy were set as explicit constraints on the delivery.
This is an anonymized engagement summary published under EPC Group's anonymized-engagement rule: the client is not named, no commercial terms are published, and every statement is EPC-reported. Named, documented engagements are in the Evidence Center.
Problem and scope
| Item | Scope |
|---|---|
| Organization | A community bank |
| Situation | Exchange Server 2016 on premises, an email security gateway, mobile-device management and an existing Microsoft 365 hybrid footprint |
| Objective | Modernize messaging on Exchange Server 2019, strengthen compliance and security, and keep interoperability with Microsoft 365 cloud services |
| Volume | About 200 active mailboxes, about 2 TB |
| Constraints | Banking regulatory requirements, cybersecurity and data privacy standards for the bank's operations and customers; minimal business disruption at cut-over |
Not reported: the cut-over date, whether every mailbox moved without exception, and any post-migration measurement.
Approach and artifacts
The engagement sets out the delivery as phases and named tasks.
| Phase | Tasks |
|---|---|
| 0 — Environment readiness and hardening | Full assessment of Exchange 2016, Active Directory, the VMware infrastructure and dependencies (email security gateway, mobile-device management, Microsoft 365 hybrid); review of backup policy against recovery objectives, with a test restore of Exchange and the virtual machines; patch and security baselines; migration accounts and access, SSL, DNS, firewall and permissions validated |
| 1 — Exchange 2019 build | Target architecture and virtual-machine configuration to EPC Group's design (OS, CPU, memory, storage, security); prerequisites installed through EPC Group's scripts and readiness checklist; certificates, connectors and permissions prepared for hybrid connectivity |
| 2 — Migration and hybrid cut-over | Mailbox migration with integrity and performance checks; transport rules, connectors and coexistence services reconfigured; mail flow and device-management integrations validated; scheduled cut-over with user-acceptance and hybrid validation; legacy servers decommissioned only after migration is verified |
| 3 — Documentation and knowledge transfer | Build and migration documentation, architecture diagrams, cut-over logs and support notes; hand-over to the bank's technical team covering patching, support and change control |
| 4 — Hypercare | Seven days of stabilization support — remediation, advisory and compliance-audit support — then a support summary, an ongoing monitoring and change-control checklist, and formal sign-off |
Why the order matters in a bank. Two things happen before any mailbox moves: backups are proven by a test restore, and the hardened baseline is confirmed. Compliance-audit support is written into the hypercare phase, and formal sign-off closes the project.
What EPC Group delivered and what is not claimed
| Claim | Basis | Status |
|---|---|---|
| The bank contracted EPC Group for an Exchange 2019 migration with hybrid enablement | EPC engagement record | Contracted (EPC-reported) |
| Cut-over completed, mailboxes migrated, sign-off obtained | Not reported | Not claimed |
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Last updated by Errin O'Connor, Founder & Chief AI Architect, EPC Group
Related service: Exchange Server Consulting | Migration
Author: Errin O'Connor, Founder & Chief AI Architect, EPC Group · Published October 25, 2026 · Project alias EPC-2025-ANON-BANK-EXCH2019 · Published under the anonymized-engagement rule.