In acquisition migrations, the source tenant is often run by the company being acquired, so its admins can change mail flow mid-pre-stage without the migration team ever knowing.

That matters because each BitTitan pre-stage pass migrates whatever mailbox content exists in the source tenant when that pass runs. If the configuration shifts between passes, what MigrationWiz migrates in later passes can shift with it. Changes that can affect pre-stage results include:

• Transport rules that delete, redirect, or alter messages
• Mailbox quota changes that trigger message deletion at storage limits
• Deleted Items purges as part of a mailbox cleanup
• Litigation Hold changes that affect what appears in the standard mailbox view

To control the risk, set a change freeze on the source tenant for the whole pre-stage period. Have the migration team review any change to transport rules, mailbox quotas, or retention policies before it goes in.

Is a change freeze on the source tenant in place for your pre-stage period?

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