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Try this KB: <a href="http://www.symantec.com/business/support/index?page=content&id=TECH125176" rel="ugc">http://www.symantec.com/business/support/index?page=content&id=TECH125176</a>
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Try this KB: http://www.symantec.com/business/support/index?page=content&id=TECH125176 [http://www.symantec.com/business/support/index?page=content&id=TECH125176]

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you would be just as quick restarting the BE Remote Agent service, usually enough to sort things.....;)
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you would be just as quick restarting the BE Remote Agent service, usually enough to sort things.....;)

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The back up job started failing with the following error: <br />
Final error: 0xe0001904 - A failure occurred querying the Writer status. &nbsp;Writer Name: Exchange Server, Writer ID: {xxxxxxxxxxxxxxxxxxxxxxxxx<wbr />xxxxxxxxx}<wbr />, Last error: The VSS Writer failed, but the operation can be retried (0x800423f3), State: Failed during prepare snapshot operation (8).<br />
I checked all of the writers on the exchange server and they are all reporting stable..<br />
Not sure what to check now..
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The back up job started failing with the following error: 
Final error: 0xe0001904 - A failure occurred querying the Writer status.  Writer Name: Exchange Server, Writer ID: {xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx}, Last error: The VSS Writer failed, but the operation can be retried (0x800423f3), State: Failed during prepare snapshot operation (8).
I checked all of the writers on the exchange server and they are all reporting stable..
Not sure what to check now..

Symantec backup 2010 R3 failing on exchange 2007

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.