BlackBerry Messenger (BBM) is available only for Android Jelly Bean and Ice Cream Sandwich (ICS) phones. Android Gingerbread users have been left out of the party till now.
From Inside BlackBerry:
The team at BBM has been busy in the kitchen over the last few months cooking up this special release of BBM for Android smartphones running Gingerbread and are now moving into an external beta ahead of the launch in February. We couldn’t be more excited, too! Supporting Gingerbread will allow millions more Android users to download the popular BBM instant messaging app.
Gingerbread devices still make up 21% of the Android marketshare. Yes; that is a lot of users that BBM should embrace. Good move by BlackBerry.