"We are pleased with the judge's decision and remain committed to implementing this settlement," said Microsoft spokeswoman Stacy Drake, in a statement.

In his order, Alvarado ruled that claims filed through Lindows.com and its MSfreePC.com site were invalid and that the only authorized settlement Web site is www.microsoftcalsettlement.com, operated by claims administrator Rust Consulting Inc. Rust must request the names and mailing addresses of those who submitted claims through the Lindows.com site and mail them information on submitting paper claims.

Lindows.com CEO Michael Robertson said that his company will not turn over the names of about 15,000 consumers who have submitted claims totaling about $1 million. Instead, the company next week will notify those consumers itself about the judge's decision.

Robertson criticized the ruling and said the official settlement Web site provides no way for consumers to file claims electronically, instead requiring a lengthy paper-based process.

"The losers here are the consumers," he said. "By not putting [the claims process] online, an enormous number of people will not take advantage of the settlement, and Microsoft will get to keep a big chunk of the money."

However, Microsoft said that the settlement includes a far-reaching process for notifying California consumers about how to submit claims. Consumers can use their portion of the settlement to buy non-Microsoft software and hardware, including products from Lindows.com, Drake said.

Meanwhile, Lindows.com and Microsoft also are embroiled in a legal battle over trademark infringement. Microsoft has claimed that the Lindows name violates its Windows trademarks.

A U.S. case is expected to go to trial early this year. A Swedish court has ordered a temporary injunction against Lindows.com pending the outcome of a lawsuit there.