RIM’s attempt to rapidly clear stock of the BlackBerry PlayBook mounted on Thursday with a new promo for business buyers. Companies that buy BlackBerry Enterprise Server 5 before the end of 2011 get a free 16GB version of the tablet. The deal is retroactive to October 12 and still includes $400 off the cost of a pro install on a given company’s behalf. @Yungjohnnybravo @TatWZA