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Check the below links it may help you<br />
<br />
<a href="http://alanhardisty.wordpress.com/2010/12/20/exchange-2007-2010-backpressure-%E2%80%93-quick-fix/" rel="ugc">http://alanhardisty.wordpress.com/2010/12/20/exchange-2007-2010-backpressure-%E2%80%93-quick-fix/</a><br />
<br />
<a href="http://support.microsoft.com/kb/2619978" rel="ugc">http://support.microsoft.com/kb/2619978</a>
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Check the below links it may help you

http://alanhardisty.wordpress.com/2010/12/20/exchange-2007-2010-backpressure-%E2%80%93-quick-fix/ [http://alanhardisty.wordpress.com/2010/12/20/exchange-2007-2010-backpressure-%E2%80%93-quick-fix/]

http://support.microsoft.com/kb/2619978 [http://support.microsoft.com/kb/2619978]

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For the past 20 hours my Exchange server has been unable to receive email (I could send) due to low disk space. I have it working again and email is trickling in. How do I go about making sure I didn't lose any emails during the time it was down?<br />
<br />
Thanks,<br />
<br />
-mike
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For the past 20 hours my Exchange server has been unable to receive email (I could send) due to low disk space. I have it working again and email is trickling in. How do I go about making sure I didn't lose any emails during the time it was down?

Thanks,

-mike

Exchange 2010 Stopped Receiving Mail due to Low Disk Space - How do I recover messages?

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.