Mailbox not removed from Outlook after delegation is removed

Hi

The reason the mailbox is still visible in Outlook is due to auto-mapping. When a user is granted access to a shared mailbox, Outlook receives extra information in the Autodiscover response that tells it to open the additional mailbox. Even after removing the delegation, the mailbox remains in Outlook until the Autodiscover response is updated.

To remove the mailbox from Outlook, you need to remove the mailbox permission and then re-add the permission with the -AutoMapping parameter set to $false. This will update the Autodiscover response and remove the mailbox from Outlook.'

Try using PowerShell commands

there may be a delay before the change takes effect, as Outlook needs to receive the updated Autodiscover response.

Thanks