Cancel the source tenant subscription before its dependencies clear, and email forwarding, external sharing links, and application authentication can all fail at once, with no recovery path.

BitTitan can move the mailbox content, OneDrive files, and Teams data to the destination tenant and the source tenant still isn’t safe to decommission. Dependencies can outlast the migration jobs:

• 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
• Source tenant MX records still receiving inbound mail for domains not yet transferred

In acquisition scenarios, decommission is often a 30 to 90 day activity after migration, not a step right after cutover. Build that timeline into the integration plan, with milestones that track each dependency to resolution before you cancel the source subscription.

Do you have a source tenant decommission checklist that is separate from your migration completion checklist?

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