Edbutil /D performs off-line compaction of the Private Information Store.
You might notice that the size of the Priv.edb file does not decrease after
you run Edbutil when you have just deleted a large number of users using
the Microsoft Exchange Administrator program.
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After a user is deleted, a background cleanup thread marks the objects
owned by that user as deleted. The disk space can only be recovered by
Edbutil after this process is complete and if a large number of users are
deleted, it will take a while.
The background cleanup thread logs entries in the Windows NT Application
Event log if the "Background Cleanup" diagnostic logging option in the
Private Information Store is set to Medium.
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