OK so I have had a few issues at work where for some reason or other users are prompted for their AD credentials when accessing the Internet through our proxy server (ISA 2000 with Surfcontrol 5.0). For the life of me I could not get to the bottom of the issue. I tried cleaning out her profile, deleting her profile, move her out of Group Policy and it still happened.
The same problem had happened before so the only other thing was to delete the user and recreate the account and re-attach the mailbox. The problem with this is that if you just delete the account you have to wait quite a lone time for the Mailbox to be marked as Orphaned from further investigation I found that you can manually run the Mailbox clean up agent, this is what then marks the Mailbox as Orphaned.
Every time I do this process there is still the air of doubt around as you are deleting the user account and all attributes to that user and I always think that they mailbox will disappear.
So if you want to move a attach userA's mailbox to userB all you need to do is the following (assuming userA already Exists):
Delete userA's account:
Select the User account with in AD and rick click and select Delete.
Then when Prompted for the are you sure select Yes (don't worry it will not delete the exchange objects)
The next thing you need to do is run the clean up agent. open up your Exchange System Manager (ESM) and navigate to the MailStore where that users Mailbox is located. Right click on the Mailbox folder and then select Run Cleanup Agent. This will then run and mark the Mailbox as Orphaned.
The Next thing to do is create a new user with no Exchange Attributes. Then in ESM right click on the Orphaned Mailbox and select Reconnect. Then type in the name of the user that you want to reconnect the mailbox to and press ok.
Once you have done that you will be able to log on as that user and then open up outlook and use that mailbox for that user.
