The parties notified the European Union's competition watchdog last week, a list of planned mergers under review on the Commission's website showed on Tuesday.
The notification concerns the acquisition of control by Microsoft of Yahoo Inc's online web-wide algorithmic search and paid search advertising business, the Commission said.
U.S. software giant Microsoft and Yahoo announced the Internet search deal in July last year in a move that could challenge market leader Google.
(Reporting by Bate Felix, editing by Dale Hudson)
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