The BlackBerry mobile data device from RIM faces being squeezed in the market, as competitors take away market share, according to analyst IDC.
IDC expects enterprise converged mobile device shipments, which include the BlackBerry, to reach 63m worldwide by 2010, up from the 7.3m in 2005.
But the analyst said RIM's stranglehold of the enterprise market will weaken.
IDC analyst Sean Ryan said, “Several BlackBerry clones have previously attempted to challenge RIM's reign in the enterprise market. But the timing is right for a more powerful attack. Nokia is offering an end-to-end solution of its own, while Motorola and Palm, among others, are leveraging Microsoft's Windows Mobile 5.0 and Microsoft Exchange."
RIM is currently the undisputed market leader in the enterprise market with more than 5.5m subscribers worldwide and annual sales of around $2bn (£1.08bn), said IDC.
IDC believes Nokia and Motorola are in strong positions because of their leadership in the overall mobile phone market, giving them influence as well as key positions within the value chains to challenge the work of RIM.
Motorola has also joined with Microsoft in offering Windows Mobile 5.0. The analyst said Microsoft was the key partner that gave device vendors such as Motorola, HTC, Samsung and Palm the ability to attack the core BlackBerry user base.
IDC expects these Windows Mobile-supported devices to take 32.3% of the market by 2010.