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When dealing with Ms Exchange Server, you don't always find a ready solution to problems. One of the most useful application you might need is ExMerge (Microsoft Exchange Server Mailbox Merge Wizard).
ExMerge is a small program that you might not use for months, but it's worth knowing how to use it before things go wrong.
It can extract data from mailboxes on your server for backup or maintenance purposes. I actually use it when someone leaves the company: after a while, I extract all the mailbox folders and save them as a .pst file, then delete all the items and close the user account.