Most PDA users were introduced to the device through the Palm OS, but Microsoft Corp.'s Windows CE .Net operating system family has pulled into a virtual tie with the pioneering PDA OS, according to first-quarter market share information from Gartner Inc. PDA vendors shipped 1.11 million units with the Palm OS in the first quarter, down 21 percent from the first quarter of 2003, said Todd Kort, principal analyst with Gartner. Shipments of Windows devices increased 4.6 percent from last year's first quarter to 1.10 million units.
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