URGENT FIX REQUIRED: A storage transient failure has occurred during content conversion.

Hello,

Please help, basically we have the same issue as the following post, only the proposed answer is not the final answer and the issue persists:

http://social.technet.microsoft.com/Forums/en-AU/exchangesvrsecuremessaging/thread/76f4b8b5-7cfe-41c1-a3ef-47aa036612a6

Environment:
Windows Server 2012 DC edition
Exchange 2013 Std edition
Outlook 2013 (Office 2013 Std edition)
No Malware protection enabled within Exchange 2013
No Antivirus application on Windows Server

Issue:
Same problem experienced with two separate installations, random e-mails are stuck in the Exchange Submission Queue with Delivery Type Undefined and retry error "A storage transient failure has occurred during content conversion."

Workaround:
Running the following command will clear the queue but causes adverse effects:

Get-RemoteDomain|Set-RemoteDomain-TNEFEnabled $true

Would be great if Microsoft could help out here, we are sort of stretching relationships with our customers..

Regards,

Lyndon.