Microsoft must produce over 300 boxes of evidence to support claims it's making in a trademark lawsuit against software start-up company, delaying the US trial from April until December.

Lindows offers a low-cost Linux-based operating system (OS) that is compatible with popular Microsoft file formats. It has been battling against Microsoft for over a year about the similarity between the Windows and Lindows names.

Microsoft claims that Windows is a trademark, while Lindows argues that windows is a generic term for a certain type of software interface that predates Microsoft's claim.

The US District Court for the Western District of Washington in Seattle has ordered Microsoft to produce evidence supporting its claims, including documents from Apple's 1992 case against the software behemoth, Lindows said.

Apple sued Microsoft for copyright infringement in 1992, claiming that the Windows graphical user interface mirrored the look and feel of its Macintosh desktop. Apple lost the suit.

The boxes the court has ordered Microsoft to produce are expected to contain testimony from dozens of witnesses, court transcripts and evidence that "windowing systems" were developed in the 1970s and 1980s before both Microsoft and Apple developed their own, Lindows lead counsel Daniel Harris said in a statement.