Over 24 million unique people use the Messenger service, and I think if memory serves me, it's still the most popular instant messenger in the UK. Nevertheless, it's still very much used by a hell of a lot of people. From my own statistics, I roughly estimate their could be around 1.8 million Messenger:mac users, so I'm sure those will be happy a new version is out.
I've said before, instant messaging is a great thing for students, holding virtual meetings, keeping in touch with your social life, and generally keeping the connections you have going. It seems every version of Messenger:mac is designed for a different sort of person - one minute it works with Microsoft's other business products, Live Communications Server 2005 for example, and now it doesn't. This new version, however, does have improved voice support, and improves the user interface for some European languages.
Head over to the Microsoft Download Center and grab the 7.01 release of Messenger:mac in English, and of course, other languages are available. I thought it'd be nice to share some Mac news with you for once; I've been here nearly a month and barely mentioned them.