<A HREF="http://news.zdnet.com/2100-9584_22-6076007.html?tag=zdnn.alert">IBM gained ground</A> on rivals Dell and Hewlett-Packard in the server market during the first quarter, according to research released Tuesday by Gartner. IBM's unit shipments grew by 19.3 percent during the quarter, faster than the overall pace of the market, while Dell and HP trailed the pace. Overall shipments grew 13.7 percent compared with last year's first quarter, but revenue was flat, Gartner said. During the fourth quarter, shipments grew 12.7 percent but revenue was up 4.5 percent.