Back when the final Windows Live Messenger build was released, many users were disappointed by the temporary drop of what is one of its most important features: The Yahoo! Messenger-Windows Live Messenger interoperability.
This disappointment should now be forgotten, as the two services are rolling out support for the interoperability as soon as tonight! (PST) In a blog post, the project's Program Manager Dan mentioned:
"Technically, this wasn't easy; we have been working on this for a while and had to try a few different ways to make it work. We're pretty excited about the solutions we've come up with for our first version of yahoo + messenger. "
He also noted that there would be a few new features added in a future release and that the build being released tonight will only be covering the basics.
Update: The sign-up page has now been made available. If you are interested in testing this, sign-up Here or go to ideas.live.com