Claymoore wrote: That's because those users already have a mailbox and you cannot re-attach a different mailbox to them. If you need to re-attach a user to a deleted mailbox, you must create a new, non-mailbox enabled user and then attach the mailbox. I accidentally deleted a user account once during an audit because the user got married and changed her name. Accounting was using her new name, HR never sent us a name change ticket and even her manager said that user no longer worked for the company. I didn't know much about Exchange at the time, but I figured out how to reattach a mailbox in a hurry.
