By most accounts there aren’t very many people out there in the world using PlayBooks, but for those that are, or are considering the purchase of one, comes some good news: RIM has finally updated the OS to include two services that have been long discussed and much anticipated: integrated email support and Android app availability. The OS could serve to give the device a boost in the market, after many people slammed RIM for shipping the tablet too early when it debuted last year without these and other features. PlayBook OS 2.0 will be available as a free download for existing users and will automatically update on new devices. Some details: The new email client — at long last integrated with the tablet and no longer requiring the user to own a BlackBerry to use email on the tablet — was perhaps the most obvious feature that RIM needed to fix in this update.