Hi,
Please send the drafts on OWA to determine if it's Outlook Client specific.
Make sure the newest version of draft has been saved before you send it.
Please test the result in Outlook Safe Mode:
Press Win + R and type “outlook.exe /safe” in the blank box, then press Enter.
If there’s no problem in Safe Mode, disable the suspicious add-ins to verify which add-ins caused this issue.
We can also test with a new profile:
http://support.microsoft.com/kb/829918/en-us
A workaround may be turning off autosave function, check if this helps.
Regards,
Melon Chen
TechNet Community Support
