Microsoft Said to Speed Windows Upgrades to Once a Year

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Microsoft Corp. plans to overhaul how it develops the flagship Windows operating system in a strategic shift aimed at keeping pace with nimbler rivals Apple Inc. and Google Inc., people familiar with the matter said.

Microsoft aims to upgrade the software more frequently, about once a year, rather than every two or three years as it’s done in the past, said the people, who asked not to be identified because the product plans are private. The company plans to unveil the first of these updates in 2013, one of the people said.