Corrupt summary TNEF content - Error 5.6.0

Hi,

We are on Exchange 2013 CU3, and users are unable to send email when a message .msg file is used to create the email via outlook.

The error message when sent to external (outside our exchange server realm) is :

   Diagnostic code = ContentTypeUnsupported; Reason code = TransferFailed; Status code = 560

     < #5.6.0 smtp;550 5.6.0 M2MCVT.StorageError; storage error in content conversion

Error when sending to internal users on exchange.

Remote Server returned '554 5.6.0 Corrupt message content; STOREDRV.Deliver.Exception:ConversionFailedException; Failed to process message due to a permanent exception with message Content conversion: Corrupt summary TNEF content. ConversionFailedException: Content conversion: Corrupt summary TNEF content. [Stage: CreateReplay]'

I looked on this forum itself and these errors existed it seems prior to 2013 as well, looks like its back in 2013 ? Would the CU 5 update deal with these issues because i almost think that upgrading to CU5 should resolve it unless there is some connector issues where we are dealing with.

Thanks