In this Thursday, Aug. 23, 2012 file photo, the Microsoft Corp. logo, left, is seen on an exterior wall of a new Microsoft store inside the Prudential
In this Thursday, Aug. 23, 2012 file photo, the Microsoft Corp. logo, left, is seen on an exterior wall of a new Microsoft store inside the Prudential Center mall, in Boston. Microsoft will use its annual developers conference to release a preview of Windows 8.1, a free update that promises to address some of the gripes people have with the latest version of the companyâ s flagship operating system. The Build conference, which starts Wednesday, June 26, 2013, in San Francisco, will give Microsoftâ s partners and other technology developers a chance to try out the new system before it becomes available to the general public later in the year. (AP Photo/Steven Senne, File) (Steven Senne)