Well, turns out I didn’t need Internet Explorer 5 at all. The reason the IE6 installer I downloaded from Microsoft was not working with Wine was that I had the latest Wine version installed, and it had a bug which prevented IE6’s installer from working. I downloaded and installed a slightly older version of Wine (20041019), and voila, Internet Explorer 6 SP1 was installed (I’m running it now).
I then managed to go to the MSN Messenger website and let IE install Messenger 7 for (which I’m also running now). So now, instead of having to use the E-Messenger website all the time, I can sign in with the Real Deal(TM). Yessss.
Details? Feeling lazy now, maybe I’ll post them later.