The settlement agreement, which was announced Wednesday, leaves just one state-court antitrust class action in Mississippi pending against Microsoft, according to Rich Wallis, the software vendor's associate general counsel and its lead lawyer in both the Iowa and Mississippi cases. Microsoft will try to get that case dismissed at a hearing scheduled to take place later this month, Wallis said.

A trial in Iowa began in mid-November and had resulted in the public unearthing of internal e-mails and documents that were embarrassing to Microsoft, including a 2004 message in which now-former Windows development chief Jim Allchin complained to top executives Bill Gates and Steve Ballmer about the progress of Windows Vista and said that he would if he wasn't a Microsoft employee.

The trial had been expected to last until at least midyear. In an interview Wednesday, Wallis denied that the public release of Allchin's message and other revealing e-mails as evidence had made Microsoft more eager to settle the Iowa case. "Most of those allegations had been out there," he said. "And those e-mails were old. We were very anxious to continue the trial so we could tell our story."

Wallis said that Gates and Jeff Raikes, president of the Microsoft division responsible for Office and the company's Dynamics business applications, were both expected to testify at the trial in the spring.

But, he added, "we have a pattern of consistently settling these old cases whenever we can [do so] on a reasonable basis. That opportunity presented itself." Wallis said Roxanne Conlin, the lead lawyer for the plaintiffs, called him on Sunday, and the two of them met at a local Perkins restaurant "and worked out most of the details."