Exchange 2013 messages stuck in Submission Queue

I am running Exchange 2013 on Windows server 2012. The mailboxes were recently moved from a 2007 Exchange server. Messages sent by some users are sticking in the Submission queue. The Last Error on these messages reads: "A storage transient failure has occurred during content conversion". I've restarted the Microsoft exchange Transport service several times but no luck. Exchange spam filtering/antimalware protection is turned off as we have a hosted solution.

Strangely this problem only affects 3 (very important) users when sending email from their Outlook 2007 client. When they send their messages using OWA they go just fine. Does anyone have any insight into this?
harold9153Asked:
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harold9153Connect With a Mentor Author Commented:
So I called Microsoft support about this issue and we changed the TNEF conversion option to Enabled in Exch 2013 which resolved this issue for us. The link below explains this.

http://technet.microsoft.com/en-us/library/bb310786(v=exchg.150).aspx
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Rsilva98Commented:
Most of the times when messages get stuck in the submission queue it's due to third party apps or event sinks that process the message before it's given to the transport mechanism. Can you try disabling your AV\SPAM stuff, restart SMTP and possibly your Exchange services, transport server to test.
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Seth SimmonsSr. Systems AdministratorCommented:
I actually spent quite a bit of time with another user on this exact same issue.  Apparently it affects Exchange 2010/2013 running on Windows 2012.  

By any chance do these users have images in their signature when sending a meeting invite to an external contact? (that was the other person's issue)

http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/Windows_Server_2012/Q_28112578.html

Since you are running Exchange 2013, have you tried to install this update to see if it resolves the issue?

http://www.microsoft.com/en-us/download/details.aspx?id=38176
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harold9153Author Commented:
Rsilva98
AV/Spam is turned off and the server Transport service restarted. Haven't re-started the server yet, but will ASAP. I don't have a lot of confidence that will fix the problem though

seth2740
I believe the users have signatures. My problem is with email being sent. Haven't noticed any meeting invites getting stuck.

Everywhere i research seems to point to CU1, might fix the problem and Microsoft highly recommends it for their customers running Exchange 2013 to fix a lot of issues. Does anyone know it it addresses this issue?
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Mark GalvinManaging Director / Principal ConsultantCommented:
Is there any pattern to the messages being stopped?

Have you seen this  http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/Windows_Server_2012/Q_28112578.html

Thanks
Pappaslim
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harold9153Author Commented:
It completely fixed my probles.
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Manoj BojewarCommented:
I also Analyzed this issue deeply and observed this issue related to signature logo where my company users adding logo link from my company website. i think exchange is not able to convert this .Please see below MS article which talks about my issue.

https://social.technet.microsoft.com/Forums/exchange/en-US/97bd4631-cce8-446c-811a-1a552511360d/urgent-fix-required-a-storage-transient-failure-has-occurred-during-content-conversion?forum=exchangesvrsecuremessaging
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Manoj BojewarCommented:
Also I am running Exchange 2013 Cu5 DAG on  windows server 2012.
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