I have several Outlook 2011 users who sometimes send emails that show up with no body content.  It does not always happen so it is very difficult to figure out. This started happening about a month ago, at least that's when these users started reporting it.  Outlook 2011 is at the latest version (no updates available).

Environment:

Windows 2003 SP2 64 Bit

Exchange 2007 with SP3 Roll Up 12.

TrendMicro WFBS for virus scanning on the mail server.  I have turned off body content scanning thinking maybe it is scanning the content and deleting it.

Exclaimer Mail Utilities to stamp on signatures.  

Please help!  Thank you.