The Microsoft MacBU could never catch up with the PC version, and MSN Messenger for Mac was lacking many features of a true instant messenger client. According to LiveSide blog, usually well informed about Windows Live Messenger, the current Mac MSN Messenger application will not be updated, instead a brand new version of Messenger for Mac OS X will be released in 2008. Windows Live Messenger 9 should ship in late 2008 or early 2009, and Microsoft is trying to work out a way for Live Messenger users to chat with AIM/GTalk/ICQ-based users. Quite amazing news as it would imply that for once Microsoft tries to improve compatibility with other IM format instead of forcing them to use its system.
[translation by Linathael]