Why can't you take a screenshot of the Outlook tools menu? Just hit the Print Scrn button, which copies a screenshot to the clipboard. Open up MS Paint and click Edit, Paste. Cut out what you want and paste it to a new canvas. Voila.
I don't use AIM, but I suspect the option you're looking for would be in the AIM properties rather than the Outlook properties. I HIGHLY, HIGHLY doubt that MS voluntarily incorporated a feature into Outlook that would open up a competitor's product (AIM v. MSN) even when you don't ask it to. AIM is definitely the culprit.