Worked great for establishing a connection, but it takes about 72 hours to update my bloody mailbox. Looks like I'll be on WebAccess after all. Thanks for your help, though!
Oh, by the way, someone should update the Uknow page for GroupWise, then. The port given on the page says 1677 instead of the default 7191. I'd do it myself, but I'd rather let someone higher up in ITS do it in case I'm misunderstanding why it's like that. Here's a link: