I am not sure if this is the correct procedure, but I had
a similar problem in a test environment. Instead of
rebuilding all the machines, I simply went into AD Users
and Computers, selected the users in question, right-click
and select Exchange tasks and deleted the mailboxes.
Before performing this step, make a good, solid backup of
your Exchange as you want it to be. Then, after deleting
the mailboxes, you should be able to remove Exchange. Upon
re-installation with disasterrecovery switch, the backup
you have will have the accounts attached to the mailboxes.
Hope this helps.
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