Microsoft announced in May it was buying Skype for $8.5 billion, its biggest-ever acquisition, placing a rich bet on mobile and the Internet to try and best rivals such as Google Inc.
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The approval was announced in a listing of deal approvals that comes out several times a week. Microsoft's interest in the money-losing, but popular service highlights a need to gain new customers for its Windows and Office software.
Skype has 145 million users on average each month and has gained favor among small businesses.