"Ground wars" (Industries, May 21), about UPS vs. FedEx, requires clarification. The story gave the market-share numbers for delivery of online purchases as 10% for FedEx and 55% for UPS. FedEx says a more accurate measure is a recent study from BizRate.com showing 16% for FedEx and 36% for UPS. The table listing unit costs and profits for the two companies mislabeled the air and ground delivery categories as U.S. The figures were for worldwide operations. Another table said FedEx has 43,500 trucks. FedEx says the total vehicle count, including its long-haul business, is 94,800. And FedEx planes are no longer blue and red but purple and orange. See the letter in Readers Report. "Sorry, Steve: Here's why it won't work," (News, Analysis & Commentary, May 21) reported that several Mac-only chains, including The Computer Store, have closed down, citing weak margins. While a single store by that name in Wichita Falls, Tex., did cease retail operations in August, 2000, it is not affiliated with Computer Stores Northwest, Inc., which operates a chain of six stores also called The Computer Store in the Pacific Northwest. Computer Stores Northwest says it has no plans to close any of these stores. BusinessWeek regrets the error. In "The most aggressive CEO" (Cover Story, May 28), J. Brad McGee, executive vice-president of Tyco International, was misidentified as a former U.S. Marine. He is a former U.S. Navy officer.