Editor's Note: This article was originally published in BullsEye, a newsletter distributed by IMS Expert Services.

Expert testimony proved to be the linchpin in a federal judge's Aug. 6th decision to set aside the largest-ever damages award in a U.S. patent case.

In San Diego, U.S. District Judge Rudi M. Brewster set aside a jury's $1.52 billion verdict against Microsoft, finding that its Windows Media Player did not infringe audio technology patents held by French company Alcatel-Lucent.

The judge concluded that the verdict could not stand because Microsoft had not infringed one of the two patents at issue and had obtained a license to use the technology covered by the other.

"The court finds that the jury's verdict was against the clear weight of the evidence," Judge Brewster wrote in a 43-page decision.

The three-week trial earlier this year focused on Lucent's claims that Microsoft infringed two patents related to MP3 audio-compression technology. On Feb. 22, 2007, the jury returned the record-breaking verdict for Lucent, finding that the patents were valid and that Microsoft had infringed them.

But on Microsoft's motion to set aside the award, Judge Brewster ruled that the verdict could not stand as a matter of law.

Microsoft's General Counsel Brad Smith hailed the decision as a "victory for consumers of digital music and a triumph for common sense in the patent system." A Lucent spokesperson called the outcome "shocking and disturbing" and said the company would appeal.

Series of Challenges

Judge Brewster's decision addresses a series of challenges Microsoft raised to the legal sufficiency of the jury's verdict and its findings as to infringement and damages. As he sifts through these challenges, Judge Brewster's opinion repeatedly weighs the sufficiency of the expert testimony on both sides of the case.

In the end, the judge's series of conclusions as to the sufficiency of expert testimony becomes the primary basis for his setting aside the verdict. These conclusions are: