Until Exchange 2003 SP2 and WinMo5 came out there really wasn't a push like technology. I've used it in testing, and it works great. The security features are not quite the same, Blackberry provides great device control via the IT policies. RIM already recognizes that Exchange+WinMo5 was going to achieve similar push functionality hence RIM's big campaign about "beyond e-mail + PIM"
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