TheStreet live-blogged the Research In Motion ( RIMM) fiscal fourth-quarter earnings release and analyst conference call after the bell Thursday. There was a little tension built into this story. RIM's BlackBerry sales have been falling in the U.S. amid the rise of Apple's ( AAPL) iPhone and the assortment of Google ( GOOG) Android phones. But as business in the U.S. weakens, sales abroad have grown. RIM's fourth-quarter report reflected these trends: The BlackBerry maker beat analyst estimates for adjusted earnings, posting $1.78 a share vs. the expected $1.76. As for quarterly revenue, RIM posted in-line numbers at $5.56 billion, up from $4.08 billion a year ago. During the company's conference call with analysts, RIM execs warned of lower revenue for the quarter, with co-CEO Jim Balsillie emphasizing a "time of cutting over" as the firm gets set to release its new, enterprise-minded tablet, the Playbook. "It's a time of enormous investment and transition," said Balsillie. "