Exchange 2010 mailbox database growing rapidly

on our Exchange 2010, each Mailbox database grows 2 GB/hour.
This happen from last Friday without any changes made on server side.
How can I fix this?
FYI, all MS Outlook 2010 clients are in on-line mode.

Thanks in advance.
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You can also just take a look at the mailbox sizes in powershell (Exchange Management Shell)

Open Exchange Management Shell (runas administrator).

Run the following commands:

 - This will tell you the names of your mailbox databases, then run the command:

Get-MailboxDatabase "Mailbox Database Name" | Get-MailboxStatistics | Sort totalitemsize -desc | ft displayname, totalitemsize, itemcount

If you run that every so often it will let you see if any individual mailboxes are increasing rapidly in size. Just compare results from the previous run.

I would not bet that is this is the issue, but it's a simple way to rule it out.
it_augusteaAuthor Commented:
Thanks for your reply. I saw the Technet article but all seems in order.
We disable some user for ActiveSync, but still the same.
If I see the mailboxes sizes, they don't grow (!!!). It's the total DB size that goes up quickly.
The email queues are empty but the size grows without apparently reason.
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George SasIT EngineerCommented:
Well, are the LOGS filling up the space or the database itself ?
Did you modified any retention policy ?
Did you modified any limits ?
Did you deployed any software with access to the outlook / exchange ?

Some details about exchange architecture would help maybe.
it_augusteaAuthor Commented:
we opened a ticket in MS and we are still waiting for a reason.
They confirmed that it's a problem in Exch2010 but at the moment no idea on what.
The DB size on disk is much greater than the total mailboxes size (including retention items and available free space in the dbs). So, we are waiting, hoping they solve the problem.
I'll update this post when solved.
Thanks for the moment
just curious ... how many mailboxes are we talking about? and what is the total size of the mailboxes ie- what should the size of the db be?

have you tried creating a new database and moving the mailboxes over?
it_augusteaAuthor Commented:
MS confirmed that it's by default!
We have to set the maintenance every night for 4 hours to reduce the grow.
They talked about the data size block that is different from Exch2003.

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it_augusteaAuthor Commented:
Ticket closed after MS check.
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