Microsoft is preparing a review of its global marketing business, and it has asked holding companies including WPP, Publicis and Interpublic to assemble teams for pitches that cover media, creative and digital, according to reports. Microsoft spent $1.3 billion on ads and promos in the U.S. in 2012, according to Ad Age. Omnicom's close ties to Apple are seen a potential conflict for Publicis, which is set to merge with the American group.

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