For years, suit-and-tie circles have bowed to BlackBerry as the king of corporate communication, but iOS has been creeping in on enterprise territory, calling into question RIM's sovereignty in the boardroom. The folks at Deutsche Bank Equity Research struck the most recent blow to RIM's enterprise dominance with the announcement that they'll buck BlackBerry for iPhone, following a trial using Good Technology's secure email app. The company tested the app in conjunction with Microsoft Exchange Server, delivering AES 192-encrypted email and calendar data to employees, and, according to the firm's research analyst, the iPhone proved an easier and faster solution to BlackBerry. Last summer, AT&T announced that 40 percent of iPhone sales are enterprise, and we just reported on RIM's possible move to devices beyond the BlackBerry. We're not saying it's off to the guillotine with the old standard bearer, but it definitely looks like there are new contenders for the enterprise crown.