One of the best things that BlackBerry has going for it right now is that its BlackBerry Messenger or BBM service is very popular with users. BlackBerry is working on opening that BBM ecosystem up to other smartphone users and has announced that it has now launched the BBM app for Windows Phone users.
The big draw for BBM is that it promises to be a secure service for messaging. Last year BlackBerry launched an app for people on the Android operating system and iOS allowing them to use BBM from those rival devices.
With the addition of the BBM for Windows Phone app, the major platforms are now supported. Keeping the BBM platform closed for so long and only allowing BlackBerry devices to use it hurt the service and made it hard to compete with WhatsApp and other rivals for secure messaging.