Remove inherited Exchange mailbox full access permissions for a user
Issue
When checking the permissions on a mailbox, you notice a user still appear to have full access permission on it despite the fact it has been removed. You also notice the permission are inherited.
Solution
Add permission again
Add-MailboxPermission -Identity <mailbox alias of additional mailbox> -User <UserAffected by Extra Mailbox> -AccessRights FullAccess -InheritanceType All -Automapping $false
Remove the permission
Remove-MailboxPermission -Identity <mailbox alias of additional mailbox> -User <UserAffected by Extra Mailbox> -AccessRights FullAccess -InheritanceType All
Source
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