European competition commissioner Karel Van Miert said at a news conference that cooperation is "rather good" with the US authorities in investigating Microsoft.
However, Van Miert declined to comment on whether the EC will launch action against Microsoft over its browser bundling activities in the EU, in line with the US Department of Justice?s recent moves.
"The US authorities, if (Microsoft) is not living up to its commitments, can take it to court. Our procedures take longer," he said.
Van Miert noted the recent settlement with Microsoft over Santa Cruz Operation's use of Unix operating system and said "we have other items in the pipeline" without going into details.
The EC and the US authorities swap analysis of cases but are declined from exchanging confidential information, he added.
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