Simpson said Blackberry again has the most extensive fleet management capabilities through Blackberry Enterprise Server, but noted that such tools were limited to its platform.
"If you want to manage other platforms - Windows Mobile, iPhones, Android, there are no capabilities built into the Blackberry Enterprise Server," he said.
The basics in Exchange ActiveSync were "good enough for some enterprises" but not for those protecting communications from senior executives.
"For general white-collar workers, productivity workers, it's usually enough," he said.
Android was "again completely lacking in terms of tools supplied with the device".
"If you want to manage a range of different platforms - not just Blackberry, not just iPhone, then those specialised vendors have some great capabilities and give you a fairly good degree of management control" he said.
"If you're just doing enterprise email and calendar and web browsing, usually it's not necessary than to go much further than the basic capabilities you get with Exchange ActiveSync," he said.
"But if you are starting to access enterprise data or storing enterprise data or developing enterprise applications on the phone, you usually need to go a bit further."
But Simpson said that users should be educated when considering management tools.
"The simple rule is, if you don't own it you don't control it," he said.
"Some of these tools do allow you to assert a degree of control over employee owned phones. The downside is that the employee has to accept that the device they own is now controlled to some degree by IT.
"Employees have to accept the fact that if they want the privilege of accessing corporate email and calendaring, they'll have to accept the fact that IT might kill their device and wipe it if they lose or misplace it."
Users should take responsibility for backing up their software or entertainment content, he said.
"Once they come into the corporate fold, IT - quite reasonably - wants to be able to control any sensitive data on that device," he said.
Simpson doesn't expect any fleet deals soon for the new iPhone or HTC Desire: "The telcos are not really set up to support fleets of phones like that".
Fleet discounts were a thing of the past except for Blackberry, which was "a bit of a different category".
"It was always intended as an enteprise device in the first place.
"You might not necessarily get a fleet deal from a telco but some of the systems integrators or the managed service providers who manage Blackberry for you can provide fleet deals."
What do you think? Is iPhone or Android ready for the enterprise? Comment below...