>You have to find out if the other mail programs can and have established themselves as the Simple MAPI client or not. Outlook and OutlookExpress both have that as a configuration item under Tools/Options.

Can't seem to find this option under Tools/Options in Outlook 2000. Do you know where it can be found there?

Will setting this option (in Outlook or OutlookExpress) create the MAPI Profiles key (Software\Microsoft\Windows Messaging Subsystem\Profiles) in the registry if it doesn't already exist?

Also, will the the MAPI Profiles key differ under different versions of Windows? (Please specify which key under which version.)