Hi,
Background
editdata.mso can be generated by any Microsoft Office application and is
routinely generated by FrontPage. It is attached to MS Outlook messages sent
in HTML format (plain text and RTF messages are not affected). It is also
created, inter alia, for Word or Excel files saved as HTML. Unfortunately,
editdata.mso can contain macros which can be malicious. For this reason,
Microsoft Exchange Forefront Security generates warning messages and
(depending on configuration) various firewalls and anti-virus applications
may bounce messages with this attachment.
Fix
The fix for Outlook which follows assumes Microsoft Office 2003 Pro and
Vista premium editions. It has not been tested with other OS or products.
Tools:Options:Other:Advanced Options:Add-in Manager
Uncheck: Exchange Extensions property page:OK:OK
Close Outlook, pause, restart.
You will still be able to send HTML messages but they will no longer have
the editdata.mso attachment.
This solution has been successfully tested with messages to a global
corporate network running Exchange Server 2003 and McAfee Corporate Security.
Messages have included various combinations of HTML/attachments/embedded
images.
Have a good day.
John