Windows Phone users get to sign up with BBM next week
BBM for Windows Phone will feature the Windows Phone UI
While Matthew Talbot, BlackBerry's Senior Vice President for Emerging Solutions, gives a number of consumer friendly reasons why BlackBerry allowed BBM to become a cross platform solution, the real answer might have a lot to do with Facebook's huge offer for WhatsApp. The latter was valued by the social networking site at $42 a user. It doesn't take a brain surgeon to understand the additional value that would be placed on BBM if millions of iOS, Android and Windows Phone users were to sign up with BBM. This gives CEO John Chen the ability to consider selling or spinning off the messaging app if things get rough.
source: BlackBerry via WPCentral
Things that are NOT allowed: