Tim,
I've never seen ExpressIt so I couldn't tell you. In OutlookExpress it is an option set from a dialog. You might try reinstalling it and it may force itself on the system.
>David, thank you for your reply. Just one more thing, though...how in the heck do I check that its the Default Simple MAPI client? Somewhere in the registry, or something through Control Panel? I am lost...ExpressIT doesn't seem to have a configuration option such as "Make ExpressIT the default Simple MAPI client".