Vendors shipped a total of 1.37 million units in the quarter, the Stamford, Connecticut, market research firm said. Hewlett-Packard Co. (HP) led the way with 408,290 units shipped worldwide, a 21% increase over its total shipments in last year's third quarter. Dell Inc. shipped 276,350 units worldwide in the third quarter, up 28% from last year. IBM Corp. came in third place with 220,083 units, up 36% over last year's third-quarter total. Sun Microsystems Inc. continued to lose ground, shipping 59,692 units in the quarter, down 2.9% from last year's third quarter.