Forum Discussion

Brass Contributor

Feb 26, 2024

Delegated user missing after mailbox migration

After migrating a user mailbox from exchange 2010 to Exchange 2016, on premise, we found that Mailbox Delegation setting was missing the delegated users but only has the "defaults". Is it possible t...

Silver Contributor

Feb 27, 2024

Hi Stefano Colombo,

you can try to reapply permissions:

- Try removing the delegated user's permission to the mailbox and then reapplying it.

[SOLVED] Unable to Access Delegated Mailbox after Migrating to Exchange 2016 (spiceworks.com)

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Leon Pavesic
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Stefano Colombo
Brass Contributor
Feb 27, 2024
Leon ,
the problem here is not to reapply the delegation later but understanding why they were removed.
It's not feasible to go, manually, after all the migrated mailbox to restore the delegation settings.
Most important we don't know all the delegation for all the mailboxes we have to migrate.