Anonymized engagement summary: consolidating an acquired company's Google Workspace and Microsoft 365 environments into its parent's Microsoft 365 tenant (2023)
Anonymized engagement summaryAcquired company of a security-systems integrator, engaged through an IT services partner (none named) · 2023
Opening answer. In 2023 EPC Group was engaged by an IT services partner for a fixed-scope project to move one acquired company into its parent's central Microsoft 365 tenant. The company ran two environments:
- Google Workspace: 427 users, 427 Gmail mailboxes and 6.76 TB of Google Drive
- a Microsoft 365 tenant used by 153 of those people, including SharePoint, OneDrive and Microsoft Teams
The scope was sized from a health check and inventory of both environments that EPC Group had already completed. It runs in four phases over an estimated nine to thirteen weeks.
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 | An acquired company of a security-systems integrator, engaged through an IT services partner (none named) |
| Source 1 | Google Workspace: 427 users, 427 Gmail mailboxes, Google Drive accounts totalling 6.76 TB |
| Source 2 | A Microsoft 365 tenant used by 153 of the 427 users, with SharePoint, OneDrive and Microsoft Teams content |
| Target | The parent company's central Microsoft 365 tenant |
| Basis | The figures are the actuals from EPC Group's health check, assessment and inventory of both environments |
| Phases | Envisioning, configuration extract and design; engage and prepare both environments; migration and deployment into the central tenant; post-deployment training and support |
| Out of scope (stated) | Power BI reports and dashboards, Power Automate workflows, Power Apps, and Copilot and other AI elements |
| Timeline | An estimated nine to thirteen weeks |
Not reported: the migration tooling, the cut-over dates and any exceptions in the final move.
Approach and artifacts
Measure first, then fix the scope. The scope is fixed because its numbers come from a completed assessment of both environments, not from estimates:
- user and mailbox counts
- Drive volume
- how many people actually use the Microsoft 365 tenant
Two sources, one destination. Mail and Drive come from Google Workspace, while SharePoint, OneDrive and Teams come from the company's own Microsoft 365 tenant. Both environments are planned and migrated in the same project.
Scope fenced in writing. Power BI, Power Automate, Power Apps and AI elements are listed as out of scope.
What EPC Group delivered and what is not claimed
| Claim | Basis | Status |
|---|---|---|
| The partner contracted EPC Group to consolidate both environments into the parent tenant | EPC engagement record | Contracted (EPC-reported) |
| Both environments were assessed and inventoried | EPC engagement record | On file (EPC-reported) |
| Migration completed, accepted, or measured results | Not reported | Not claimed |
Related services
Microsoft 365 consulting · All case studies · Talk to a senior architect
Last updated by Errin O'Connor, Founder & Chief AI Architect, EPC Group
Related service: Microsoft 365 Tenant Consolidation for M&A
Author: Errin O'Connor, Founder & Chief AI Architect, EPC Group · Published October 25, 2026 · Project alias EPC-2023-ANON-GWS-T2T · Published under the anonymized-engagement rule.