# Migrations, M&A, Tenant Consolidation

> One tenant, one identity, one bill — and a paper trail clean enough to hand to an auditor.

Canonical: https://o365hq.com/solutions/migrations-ma-tenant-consolidation
Provider: IT Partner LLC — US Microsoft partner since 2006. Book: https://o365hq.com/book

**Stack:** Mailbox · file · workload · cross-tenant

## The situation

You acquired three companies, each with its own M365 tenant, identity provider, and SharePoint sprawl. Your CFO wants one bill. Your CISO wants one identity.

## The problem

Every acquisition brought its own tenant, its own naming convention, and its own way of doing permissions. Users live in two Outlooks. Files exist in four places, three of them stale. Licensing is duplicated and nobody can say by how much.

The organization needs one identity and one bill — but every consolidation story you've heard from peers involves a lost mailbox, a furious executive, and a weekend that didn't end.

## Solved looks like

- Mailboxes, files, Teams, and identities land in one tenant on a schedule people were actually told about. Nothing user-facing disappears without a mapped replacement.
- Duplicate licensing gets found and eliminated during the move, which often pays for a meaningful slice of the project.
- You get a runbook and a paper trail — who moved, when, what changed — clean enough for the auditor and the board.

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Talk it through with Mike: https://o365hq.com/book