BRUSSELS, June 25 (Reuters) - EU antitrust regulators on

Tuesday charged Microsoft ( MSFT ) of illegally bundling its

chat and video app Teams with its Office product and say that

recent moves by the U.S. tech giant to unbundle the package were

insufficient and more needed to be done.

"Microsoft ( MSFT ) has breached EU antitrust rules by tying its

communication and collaboration product Teams to its popular

productivity applications included in its suites for businesses

Office 365 and Microsoft ( MSFT ) 365," the European Commission said in a

statement.

"The Commission preliminarily finds that these changes are

insufficient to address its concerns and that more changes to

Microsoft's ( MSFT ) conduct are necessary to restore competition," it

said, referring to Microsoft's ( MSFT ) unbundling of Teams from Office

announced in recent months.

The move by the EU competition watchdog was triggered by a

2020 complaint by Salesforce ( CRM )-owned competing workspace

messaging app Slack.

Teams was added to Office 365 in 2017 for free and

subsequently replaced Skype for Business. Its popularity soared

during the pandemic due in part to its video conferencing.

Microsoft ( MSFT ) said it would work to find solutions to address EU

regulators' concerns.