Ever since the Sunnyvale-based company announced the availability of Yahoo Messenger for Vista, users out there downloaded and tested the application even if it was only a preview of the upcoming IM client. Unfortunately, this very early version of the program provided a limited number of functions so users couldn’t really test too much of it. Today, Yahoo debuts a new edition of Yahoo Messenger for Vista which incorporates several functions which have already been introduced in the other versions of the application, namely YM 8 and YM 9 Beta: voice support and SMS functions.

Obviously, the voice support lets users of Yahoo Messenger communicate by voice through Yahoo’s in-house VoIP technology. Earlier this week, Yahoo announced a deal with JAJAH, a popular communications company which would provide the Phone In and Phone Out Yahoo Messenger functions. However, YM’s PC-to-PC calls will still be based on Yahoo’s own solution.