After two full weeks without Demo 19 errors, I can safely say "It's FIXED!!!".  We have logs going back for the server well over two years, and never before have...

I don't know if this is still an issue for you, but you should check out MS knowledge base article 839405, which indicates a stack dump very simlar to yours....

I've found a good web cast from Microsoft that discusses this sort of issue --

http://support.microsoft.com/default.aspx?scid=/servicedesks/webcasts/wc091301/WCT091301.asp

It's old, but has some good information -- I'm currently looking at the possibility...

Thank you all so much for the quick replies!

We seem to have two versions of Outlook on the server, Outlook contained in Office 2000 SR1 Pro (9.0.6926 SP3)  and Outlook...