As Research in Motion executives prepare to face nervous investors at the company’s annual meeting on Tuesday, Apple has launched a campaign to steal BlackBerry’s enterprise client base. The iPhone maker bought a back cover ad in a recent issue of The Economist that hypes its business apps, targeting a section of the smartphone market that has been traditionally loyal to RIM. Apple has also launched a website advertising the iPhone’s business features. The move comes at a difficult time for RIM, which has seen its stock price sink 50 per cent this year. Some shareholders have called for a management shuffle.