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Exchange 2010 edb file swollen more than double actual usage.

We have an Exchange 2010 with about 70 mailboxes running on Win 2008 R2 server. Although the sum up of all the mailboxes is only about 80G we found out the .edb file is currently about 172G, which is more than double in size. This is the second time in the last two months we found this issue. Last time we moved all mailboxes out to another edb file and delete the old edb.
Obviously there must be a root cause which was not resolved by moving out mailboxes and deleting edb. Can you tell us what could be wrong? How to fix it?
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Avatar of Will Szymkowski
Will Szymkowski
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edb files grow from messages coming into them.  Have you had an email storm lately?

Make sure you are on all of the latest Exchange 2010 updates, although I don't know of any issues where the edb files were growing uncontrollably.
Creating new Db and moving mailbox is best option, which you already did last time. There is script from MS, which can help you to find the reason. Check it.

http://blogs.technet.com/b/exchange/archive/2014/01/06/exchange-2010-and-2013-database-growth-reporting-script.aspx

Also, reduce the deleted mailbox and item retention period on your database. If you have mailbox set on legal hold you might need to disable it and clean up the mailboxes recover delete items.
Agree with Amit. creating and moving to a new DB will clear white space and reduce up to 60% of the size