If you are setting a source tenant decommission timeline for an acquisition migration, make sure you have accounted for the dependencies that still exist after BitTitan migration jobs complete.

Even when BitTitan has moved mailbox content, OneDrive files, and Teams data to the destination tenant, that does not automatically mean the source tenant can be safely decommissioned. Important dependencies can remain and must be addressed before decommissioning.

Examples of post-migration dependencies include: email forwarding from source mailboxes to destination mailboxes for inbound mail still hitting source domain addresses; SharePoint external sharing links that reference source tenant URLs; Teams Guest access configurations tied to source tenant accounts; Entra ID application registrations that authenticate users from the source tenant; and source tenant MX records that may still be receiving inbound email for domains not yet transferred.

In acquisition scenarios, source tenant decommission is often a 30 to 90 day post-migration activity rather than an immediate post-cutover step. The integration plan should include that decommission timeline, with milestones that track each dependency through resolution before cancelling the source tenant subscription.

If the source tenant subscription is cancelled before dependencies are cleared, email forwarding, external sharing links, and application authentication can all fail at once with no recovery path.

Have you created a source tenant decommission dependency checklist that is separate from your BitTitan migration completion checklist?

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