WATERLOO, ON – Research In Motion cut its earnings outlook for the first quarter after experiencing lower than expected shipments of BlackBerry smart phones and lower than average selling prices for the devices.The BlackBerry-maker said that it anticipates revenue that is “slightly below” the range of US$5.2-5.6 billion that it forecast last month, in addition to a drop in its fully diluted earnings per share for its first quarter which ends May 28.RIM also said that expected shipments of its BlackBerry PlayBook tablet in the quarter “continue to be in line with our previous expectations”, and noted that it has not experienced...