However, a new (PDF) from security firm Trend Micro suggests that RIM's new OS, BlackBerry 7, is the most secure platform for businesses, ahead of iOS. With RIM having recently stated its intention to refocus on the business market (though not abandon the consumer space, as some reports incorrectly claimed) could Apple's progress into the enterprise be stalled?

"Corporate-grade security and manageability" makes BlackBerry 7 the option of choice for enterprise, says Trend Micro's report, though it isn't without its problems.

"Many features and protections that are commonly enabled or enforceable via the BlackBerry Enterprise Server (BES) are not present on devices that are user-provisioned via BlackBerry Internet Services (BIS). In fact, some of the strongest features restricting high-risk activities that users may undertake, such as removal of password protection for the device, may be rendered inactive if a user's device is not provisioned via the BES," Trend Micro says in its report.

And while iOS 5 came second to BlackBerry 7 in the rankings, which Trend Micro scored on a combination of factors including built-in security, application security, authentication, device wipe, device firewall and virtualisation, it was placed ahead of Windows Phone 7.5 and Google Android 2.3.

Indeed, there is plenty to recommend iOS 5 for enterprises, the report says. "The iOS application architecture natively provides users much protection because all applications are 'sand-boxed' in a common memory environment. Security in iOS also extends to the physical attributes of the iPhone and iPad.