Since Microsoft’s and Yahoo’s agreement last year to make Windows Live Messenger and Yahoo Messenger interoperable so users could exchange instant messages between each other on the different networks, we now have some more proof that it’s in testing, as found out by inziga a member on the trillian forums.

One problem though it seems to be only working on the Yahoo Messenger for Mac so youll need a Mac to test this out, or a virtual Mac OS, or even a friend that has a Mac! 😉

All you have to do is log in to Windows Live Messenger with your passport account (must be @msn.com or @hotmail.com) and log in to Yahoo Messenger for Mac with you Yahoo screename and add a passport account as a contact in Yahoo Messenger Beta for Mac, and hopefully you’ll be able to talk.

For an image of this check out the trillian forums.