Microsoft sought EU antitrust approval on Friday for its $26 billion bid for social network LinkedIn lnkd , a spokesman said on Friday, kicking off a month-long review by regulators of its largest deal.

“We filed today,” company spokesman Robin Koch said.

He said the European Commission has set a Nov. 22 deadline to examine the case. The EU competition authority can either clear the deal with or without concessions or it can open a lengthy investigation if it has serious concerns.

U.S. software company Salesforce crm has criticized the takeover, saying it threatens innovation and competition.

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Microsoft msft is expected to say that there is more than enough competition from Facebook fb and social networks on smartphones.

Antitrust regulators in the United States, Canada, and Brazil have already cleared the deal.