I had seen MS press release regarding messenger interoperability, but didn’t get a time to test this feature.

SUNNYVALE, Calif., and REDMOND, Wash. — July 12, 2006 — Yahoo! Inc. (Nasdaq: “YHOO”) and Microsoft Corp. (Nasdaq: “MSFT”) today will begin limited public beta testing of interoperability between their instant messaging (IM) services that enable users of Windows Live® Messenger, the next generation of MSN® Messenger, and Yahoo!® Messenger with Voice to connect with each other.

Looks cool, Right? Hopefully someone will come-up with a specification (RFC) for messengers, so that all messengers can interact each other. Ofcourse there will be some challenges for voice/webcam/game supports. For end users, it is all about user eXperience.