BARCELONA, May 5 (Reuters) - Microsoft ( MSFT ) Chairman

Brad Smith has told the European Commission his company will

abide by European rules whether it agrees or not with them, the

Commission's Vice President Teresa Ribera said on Monday.

The U.S. tech giant said last month it would sell its chat

and video app Teams separately from its Office software

globally, six month after it unbundled the two products in

Europe in a bid to avert a possible EU antitrust fine.

Salesforce ( CRM )-owned Slack complained to the European

Commission about Microsoft's ( MSFT ) tying of Teams with Office.

(Reporting by Pietro Lombardi, editing by Inti Landauro)