The European Commission, fresh from a major court victory over Microsoft, launched new antitrust investigations into the software giant on Monday on suspicion it abused its market dominance to favor its Web browser and Office product.

The European Union executive said it would look into complaints from rivals that Microsoft unfairly tied its Web browser to the Windows operating system and made it harder for software rivaling Office and Outlook to work with Windows.

It was acting after receiving a complaint from Opera, a Norwegian maker of a Web browser which competes with Internet Explorer.

Another complaint was lodged by a software makers group, the European Committee for Interoperable Systems, which said Microsoft did not disclose enough interoperability information for a range of products that compete with Office and Outlook.

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