Exchange 2010 - A storage transient failure has occurred during content conversion

On Exchange Server on traking log and mail not delivered we saw this error:

A storage transient failure has occurred during content conversion.

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Exchange 2010 SP3 CU2 will solve problem.

To apply a workaround you can see this article

http://enterpriseit.co/microsoft-exchange/transport-bug-exch-2010-win-2012-550-4-4-7-queue-expired/

Otherwise solution it was to apply CU 2 at least following this procedure:

1. Execute Exchange Powershell as administrator
2. Launch this syntax:
   
   msiexec /update Exchange2010-KBxxxxx-x64-en.msp