Shorts are making big bets against BlackBerry (BBRY -1.3%) ahead of tomorrow morning's FQ1 report: combined short interest in NYC and Toronto reached 33% of shares outstanding on June 20, a new high (per Markit). National Bank and Citi recently raised the possibility of a post-earnings short squeeze, albeit while reiterating bearish stances. Many on the sell-side are now forecasting solid FQ1 numbers, aided by channel fill and Q10 sales to the existing base. But commentary on future quarters is more cautious. Also: BlackBerry announces 18K BES servers have been installed, and BES 10 has been ordered, downloaded, or installed by 60% of Fortune 500 companies.