Unable to remove user mailbox, when you have sufficient enough rights.
Microsoft Exchange Error
The user has insufficient access rights.
- Log into your Domain controller and fallow the steps below
- Click Start type ADUC.msc
- On the View Click on Advance futures , click on object tab and clear the check mark where it says “Protect object from accidental deletion”
- Try to delete again, you should be fine.
Oz Casey, Dedeal