https://www.m365.fm/entity/migration-coexistence/A migration phase in which the old and new environments, for example two Microsoft 365 tenants, run side by side and are linked so mail and collaboration keep working while users move in batches.enhttps://www.m365.fm/show/episodes/microsoft-365-tenant-to-tenant-migration/https://www.m365.fm/show/episodes/microsoft-365-tenant-to-tenant-migration/Wed, 28 Oct 2026 00:00:00 -0000episodeA merger or divestiture can turn two Microsoft 365 tenants into one, and copying files is the easy part. This episode explains in plain language what moves, what breaks and why the domain flips last, for IT leads and project owners who need to plan a…