Anonymized engagement summary: consolidating an acquired company's Google Workspace and Microsoft 365 environments into its parent's Microsoft 365 tenant (2023)
Contracted — countersigned (EPC-reported; documents private)First-pass editionAn acquired company of a security-systems integrator, engaged through an IT services partner (none named) · 2023 · Project ID EPC-2023-ANON-GWS-T2T
Last updated by Errin O'Connor, Founder & Chief AI Architect, EPC Group
Opening answer. In November 2023 an IT services partner countersigned a fixed-scope statement of work with EPC Group 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.
Disclosure. This is an EPC-reported anonymized engagement summary. The partner, the parent company and the acquired company are not named. The countersigned statement of work and the assessment workbooks are retained privately and are not published in the Evidence Center, so this account is outside the Evidence Center's documented-engagement counts. Every engagement fact below is taken from those documents.
Verification class
Contracted — countersigned (EPC-reported; documents private). The partner signed the statement of work electronically in November 2023. The assessment workbooks for the two environments are dated October to November 2023. No cut-over record, acceptance or outcome measurement is cited or claimed.
Buyer problem and scope
| Item | What the documents state |
|---|---|
| Buyer | An IT services partner delivering for its end client, a security-systems integrator, which had acquired the company (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 |
Unknowns, not stated in the documents cited: the migration tooling, the cut-over dates and any exceptions in the final move.
Approach and artifacts
Measure first, then fix the scope. The statement of work is fixed-scope 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.
Documents (dated, held privately):
| Document | Date |
|---|---|
| Assessment workbooks for the Google Workspace and Microsoft 365 environments | October–November 2023 |
| Statement of work, Google Workspace and Microsoft 365 to the central tenant (countersigned) | November 2023 |
Results and limitations
| Claim | Basis | Status |
|---|---|---|
| The partner contracted EPC Group to consolidate both environments into the parent tenant | Countersigned statement of work, November 2023 | Contracted (EPC-reported; documents private) |
| Both environments were assessed and inventoried | Assessment workbooks and the statement of work's stated actuals | On file (EPC-reported) |
| Migration completed, accepted, or measured results | No document cited | Not claimed |
Provenance
- Sources: the countersigned statement of work (November 2023) and the assessment workbooks (October–November 2023), held privately. Engagement ID: EPC-2023-ANON-GWS-T2T, an alias unrelated to any client's name.
- Anonymization: industry and organization type only, under EPC Group's anonymized-case rule; the partner, the parent and acquired companies, locations, staff names and commercial terms are not published.
- Not claimed: client endorsement, completion, or any measured result.
- Author: Errin O'Connor, Founder & Chief AI Architect, EPC Group, named in the statement of work as leading the initiative.
Revision history
- 2026-10-25: anonymized engagement summary published from the engagement's statement of work and assessment workbooks.
Related service
Microsoft 365 tenant consolidation for mergers and acquisitions · Microsoft 365 consulting · Talk to a senior architect
Author: Errin O'Connor, Founder & Chief AI Architect, EPC Group · Published: 2026-10-25.