Microsoft is celebrating a recent court decision to overturn a $1.52 billion award of damages in a patent infringement case brought against it by Alcatel-Lucent. This followed a ruling that Microsoft had not infringed two of Alcatel Lucent's patents. The technology covered by these patents relates to the compression of MP3 files that was developed by a German company in the 1990s. This company subsequently became part of Alcatel Lucent. Microsoft had licensed the technology from the German company but an argument developed as to whether this licence was sufficient. The initial decision had raised the spectre of similar cases being brought against other industry main players such as Apple. This now seems a more distant prospect. Alcatel Lucent has a number of other cases pending against Microsoft however so the battle for protection of intellectual property looks certain to continue on its multiple fronts.