Finding out after cutover that 15 users can’t open a shared mailbox is a hypercare ticket you could have avoided.

BitTitan MigrationWiz migrates shared mailbox contents. The Full Access and Send As permissions delegates held in the source tenant don’t carry over to the destination shared mailbox, so you have to set them yourself:

1. Create the shared mailbox in the destination tenant.
2. Assign Exchange Online Full Access to every delegate, using their destination user accounts.
3. Verify the assignments are in place before the MigrationWiz jobs for that mailbox run.

Setup takes about 10 minutes per shared mailbox. Fixing it afterward means updating permissions, waiting for Exchange Online to propagate them, and validating access for each affected delegate.

For a shared mailbox with a large number of delegates, validate the permission setup during the pilot before running the full project.

Are you setting destination shared mailbox permissions before your cutover runs?

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