Are you using Outlook Express when the icon pops up on your task bar?
I've got windows media center. Intermittantely the messenger appears on my task bar. I don't use messenger so I'd like to know why the program is running. When I try to exit the program it says I can't stop the program because some other app is using it. Any ideas?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic