After a long wait, Redmond giants finally released the final version of Messenger 8 for Mac. Among the most important innovations of this new version is video, audio chat. It also seems that developer wants to give Messenger for Mac looks similar to Windows version. For example, the aesthetics of the contacts is similar, and the visual theme as well.
Given that they have done the same with Office for Mac 2011, it appears that this is a new Microsoft policy: the search for its software for Windows and Mac have a similar interface, thus reducing learning curve for those who have to use both versions.
Download Link | Messenger 8 for Mac