can it be there is a limit of attachment size that your company allows to go out and you might have overshot the size limit?
maybe you can check your outbox to see if it is still there... if it is then just delete it and see if you will see this message again
Last Wiki Answer Submitted: May 11, 2010 3:26 am by jinteik15,485 pts.
If you live outside the United States, by submitting your email address you consent to having your personal data transferred to and processed in the United States.
Try http://www.recoverytoolbox.com/repair_outlook.html works with damaged .pst files and big files too, more than 1GB up to 16TB.