News of Blackberry Messenger making its way to Windows Phone are not a secret. Invites to participate in a public beta went live as soon as we brought you news of the app’s emergence on the Windows Phone Store though the testing phase was still the reserve of a few. That “few” is expanding today to include even more regular Windows Phone users who signed up to be beta testers.
The BBM Beta app can be found on the Windows Phone Store so if you signed up and already got the confirmation email then go ahead and download. For the rest, you’ll have to wait till the official rollout starts. This is for the better as the beta version is said (though quite expected) to be plagued by various bugs that makes it unsuitable for ordinary use.