Also

Sun Microsystems Inc. has taken the top spot in the U.S. market for powerful server computers from IBM Corp., which kept its title as the main server seller worldwide, according to a widely watched International Data Corp. report. . . . CSFBdirect, Credit Suisse First Boston’s New York-based online brokerage, plans to fire 150 employees, or 10% of its work force, and close its New Jersey call center to trim expenses as individuals reduce trading on the Internet. . . . Homes.com, an online provider of home-selling services based in Menlo Park, Calif., said it will lay off about 150 employees, or about 40% of its work force.