How do I reduce the physical size of the store in exchange 2010?

WeThePeople used Ask the Experts™
The exchange store is 24 GB in size.

For the first time, I have enabled "auto archive" in Outlook on each user's computer.  E-mails over 30 days old, are archived to the users c:\drive.  Archive occurs every day.  With this being done now, it seems to me that the exchange store should decrease in size to about 5 GB.

Do I need to do anything (like defragment) to make this happen?
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You will need to defrag the database to reclaim the whitespace.

Eseutil /D from what I recall.
See this MS KB for details -

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