text: Probably 95% of AIM users are there by default - they signed up for internet via AOL, and AOL pushes its OWN programs almost as bad as Microsoft does theirs.\n\nI'd speculate that 60%?? of MSN users use MSN simply because it comes with Windows.\n\nThose with enough gumption to get out and actually SEARCH for an IM program, and perhaps COMPARE different ones, probably usually end up with YahooMessenger - the BEST in my view. \n(Maybe 5-10% of YM users are there due to SBCGlobal/Yahoo signup - others, by CHOICE).\n\nBut.... perhaps ONE good reason to use AIM might be simply if all your friends are on AIM - though you can still go to something like www.trillian.cc or Gaim which can access most IM programs including AIM all at once.