Sales of Research in Motion's BlackBerry mobile email devices increased by more than 30 per cent in the first quarter of 2006 compared with the same period last year, according to new data from Gartner.

RIM sold 930,000 of its mobile email devices between January and March this year, helping the overall market for PDAs to grow 6.6 per cent to 3.7 million units. The BlackBerry currently commands 20.7 per cent of the worldwide PDA market. More