Forum Discussion

Stefano Colombo's avatar
Stefano Colombo
Brass Contributor
Feb 27, 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 that it's due to the fact that the delegated user mailbox was still on exchange 2010 ?

  • LeonPavesic's avatar
    LeonPavesic
    Silver Contributor

    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)


    Please click Mark as Best Response & Like if my post helped you to solve your issue.
    This will help others to find the correct solution easily. It also closes the item.


    If the post was useful in other ways, please consider giving it Like.


    Kindest regards,


    Leon Pavesic
    (LinkedIn)
    (Twitter)

    • Stefano Colombo's avatar
      Stefano Colombo
      Brass Contributor
      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.

Resources