How do I stop the Outlook prompt to save changes every time I close a message?

Over night a new problem has appeared in my SBS2003 Exchange network.

Every time any of my users opens an email message using Outlook (03 and 07 both), and then try to close the message, they get a prompt that says:

The properties of the message <message subject line> have been changed. Do you want to save the changes to this message?

This was not happening yesterday, and it is the case for every message with every user, using both 03 and 07 versions of outlook.  I haven't seen an exception yet.

I have a Microsoft Small Business Server 2003 box running Exchange.  All my users are NOT running cached Exchange mode, but changing it to cached mode did not help.
Outlook-Save-Prompt.JPG
beikokuAsked:
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Shanmuga SundaramDirector of Software EngineeringCommented:
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beikokuAuthor Commented:
I have tried those things, but nothing changes.  It makes no difference whether or not there are images downloaded from the Net or attachments.  Even with a plain text email that has no attachments, I get this prompt when trying to close the message.  EVERY user in my network is getting it with EVERY message they try to close, and it only started this morning.  My suspicion is that this is due to an Exchange server setting somewhere... maybe?
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beikokuAuthor Commented:
Turns out it was due to a third-party plug-in.  Outlook 07: Tools --> Trust Center --> Add-ins --> Manage COM Add-ins (Go) and uncheck the box.  I unchecked all boxes and added them back one at a time until I found the culprit.  Outlook 03: Tools --> Options --> Advanced....
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