While Messenger does come with Windows Phone, you would think Microsoft would take the opportunity to list with the other devices that you could communicate with, especially since it’s their own device. The good news is, at least on the mobile messenger information page at explore.live.com Windows Phone gets its own tab.
This time we’ll chalk it up to the ‘ol whoops. Hopefully moving forward Microsoft will take any opportunity it can to promote its own devices.
source: WP7 Connect