WATERLOO, ON – Research In Motion released the 2.0 software upgrade for its PlayBook tablet early on Tuesday morning. The PlayBook OS 2.0 software update is available as a free download. Some of the new features include a unified inbox that consolidates personal and work email accounts as well as messages from Facebook and Twitter in one place, an updated BlackBerry Bridge app that provides a Bluetooth connection between the tablet and core apps like BBM on the BlackBerry smart phone, plus a range of new Android apps and content. “Building on the BlackBerry PlayBook tablet's proven web browsing, multimedia and...