How much space off line defrag will free up?

Hi
Using Exchange 2003.
Have cleared a few mailboxes lately. I'm thinking of running an off line defrag.
Before I run it, is there a way I can get an idea of how much space it would free up?
Thanks
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jdhackettAsked:
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Glen KnightCommented:
Look for event ID 1221 in the application log, this will tell you how much free space there is.

Also have a look at my article here for some additional information: http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_2730-Exchange-Offline-Defrag.html
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DesertCrocCommented:
Problem with offline defrag is you will need double your current DB size of space to perform as it actually creates a new DB during the process. I generally just create a new DB and do mailbox moves of the users as it only takes them offline for a minutes as opposed to many hours for an offline defrag. The result is identical.
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dhruvarajpCommented:
yes defrag does require 110 percent of the database size to be available on the volume where you want to run defrag,
if you have enterprise edition of exchange moving mailboxes is a betterway to go.

Thank you
Dhruv
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