A number of states including California and New York filed legal briefs Friday supporting their earlier request to extend the government's restrictive antitrust oversight of Microsoft Corp. The states said in a court filing that extended oversight of the Redmond, Wash.-based software giant is necessary for "meaningful marketplace competition."

A group of state attorneys general urged a federal judge on Tuesday to hold Microsoft Corp. to a 2002 antitrust settlement another five years so that the company can't stymie embryonic Web 2.0 rivals of its Windows operating system.

U.S. District Judge Colleen Kollar-Kotelly issued a ruling this evening extending the expiring terms of Microsoft's U.S. antitrust consent decree until Nov. 12, 2009, two years from the previous expiration date. California, New York and other states had been asking for a five-year extension; Microsoft had argued that none was needed.

Plaintiff States California, Connecticut, Iowa, Kansas, Minnesota, the Commonwealth of Massachusetts and the District of Columbia (“California Group”)1 respectfully submit this Report on Remedial Effectiveness.

I thought you might like to see the court's order regarding Microsoft, extending the US District Court for the District of Columbia's oversight. There are actually two documents, one released for the public, a kind of executive summary [PDF], and then a much longer (78 pages compared to 6) Memorandum and Order, which is available from the US District Court for the District of Columbia's website's daily list of orders. I have them both as text.

Updated at 4:00 p.m. PDT: In something of a surprise move, four state attorneys general who previously praised the effectiveness of Microsoft's antitrust settlement with the feds said they're not ready to see five years of oversight wind down just yet.

The European Commission confirmed it has received a complaint about Microsoft's business practices from a British government agency Tuesday, but isn't following it up as it normally would with an antitrust complaint, according to a press officer.

In the next seven days, both Microsoft's European Union and United States antitrust cases will reach critical junctures. A routine U.S. hearing tomorrow will likely be anything but routine. Elsewhere, an appeals court will issue a ruling on the validity of Microsoft's adverse antitrust case in Europe.

Microsoft may have won a year-long quest to make its Office Open XML document format an ISO-recognised international standard, but claims of foul play in the voting process may come back to haunt the software giant when the European Commission concludes its latest antitrust investigation of Microsoft's business practices.