BlackBerry Messenger's scattered design and basic features keep it behind the competition.
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Windows Phone users who signed up for the BBM beta tester program can now download and install the app.
Windows Phone users who want to take BlackBerry Messenger for a spin will have to cool their heels a bit.
Blackberry's new encrypted BBM messaging software is a reflection of its renewed focus on business customers.
In the works are updates for two popular BlackBerry products, Secure Work Space corporate email and the BBM messaging program for Android and iOS.
New features include a BBM Shop that sells stickers and sponsored posts and invitations for BBM Channels. BlackBerry says it won't intrude on the core messaging experience.
Sponsored content will pop up in BBM Channels, but BlackBerry says it won't interfere with actual chats.
BlackBerry BBM chief John Sims tells CNET about why there was "no choice" but to go cross platform, fixing BBM's sign-up process, and BBM's mobile banking potential.
The mobile transfer of money is popular around the world, but it's becoming increasingly attractive to firms competing in foreign markets.
BlackBerry's Messenger app will also wend its way to the new Nokia X platform.