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A AD user account has been deleted by accident, we have recreated the user account, but obviously its a different GUID, however I cannot figure out how to reconnect the mailbox to the new GUID. Is there anyways to do so?

I've tried to disable to the mailbox, but it will not happen because Exchange cannot find the old AD object to remove the EX info from it. Any other ideas?

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You sound like you are on the right track. A disabled box can be attached to a new account.

See this link:

I think with the powershell objects you can force the disable and the cleanup that resets the box for reconnection all at once. See this:

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Great, thanks, I didn't have to do the disable portion (I actually couldn't, I tried, I received errors that the object could not be found) I ran the clean-mailboxdatabase cmdlet and was instantly able to reconnect the mailbox. However now the box seems to be completely empty with no email. – Timbermar Jul 14 '11 at 17:30
When attempting to open the mailbox in outlook the error message "Cannot display the folder. Microsoft Office Outlook cannot access the specified folder location. The operation failed. An object cannot be found." The properties of the mailbox from the exchange console show it containing items. – Timbermar Jul 14 '11 at 17:44
You may have to change the ownership of the folders so that the user can access them. Set them to have FullAccess to it, you can do that from the GUI with a right-click on the MailBox. – Mark Jul 14 '11 at 17:53
That's what I had suspected, I've gone through the settings, they are exactly the same as every other mailbox, and I even explicitly gave myself access, I can now expand the folder, but I still see no email. Any new email sent to the mailbox appears, but none of the mail that was there previously – Timbermar Jul 14 '11 at 18:33
Can you click on Inbox or one of the other folders to highlight it in Outlook? Then in Tools pick "Recover Deleted Items..." and see if there is stuff marked for deletion. – Mark Jul 14 '11 at 20:58

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