A US federal judge ordered Microsoft to pay Alcatel-Lucent $511.6 million in damages and interest, letting stand a jury's decision that the software maker infringed on two patents.

Microsoft vowed to appeal the decision, which marked the latest move in a 5-year-old patent scuffle between the two companies.

The world's largest software maker had asked the US District Court in San Diego to reconsider a federal jury's award in April to Paris-based Alcatel-Lucent of $357.7 million in damages.

The jury found that the software maker infringed on an Alcatel patent that covers how software users select a calendar date from a menu in certain programs, including Microsoft Outlook and Windows Mobile.

The jury also awarded Alcatel-Lucent $10.4 million from Microsoft after finding the software maker infringed on an patent related to the use of a stylus on a tablet computer.

Earlier, Judge Marilyn L. Huff denied Microsoft's request that she reconsider those findings, and she raised the amount of damages due Alcatel-Lucent.

The amounts now include prejudgment interest to compensate for how long it took to resolve the matter.

"We are disappointed that Judge Huff denied our request for a new trial," said Microsoft spokesman David Bowermaster, in an e-mailed statement. "We plan to appeal the rulings against us. We are confident that the damages award against Microsoft will not be sustained on appeal."

Huff also upheld the jury's decision that Microsoft's video encoding technology doesn't infringe on a third Alcatel-Lucent patent. Bowermaster said the company was pleased with that decision.

In April, the jury also found that PC maker Dell infringed on the stylus-related patent. In the Thursday order, Huff affirmed that Dell must pay damages of about $70,000 to Alcatel-Lucent, including prejudgment interest.

Source:AP News