"The timing is right for a more powerful attack against BlackBerry as competitive forces converge," said Sean Ryan, research analyst for mobile markets at IDC.
RIM currently dominates the mobile email market with 5.5 million subscribers worldwide, according to company estimates.
But IDC believes that the overall market still is far from exhausted, predicting shipments of mobile email devices to reach 63 million by 2010, up from 7.3 million in 2005.
Nokia and Motorola are in a good position to take over RIM's lead, IDC claimed, because they are the largest and second largest maker of mobile phones worldwide.
IDC also suggested that enterprises will be attracted to devices that run Windows Mobile and work with Microsoft Exchange, such as the Motorola Q and Palm's Treo.
The analyst firm predicted that Windows devices will claim 32.3 per cent of the market by 2010.
BlackBerry devices run on proprietary software and require enterprises to run the BlackBerry Enterprise Server to provide access to email.
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