Apple, in turn, has accused Psystar of destroying evidence, including source code and e-mails, and has asked a federal judge to punish the company.

In an e-mail to customers, Psystar said it had struck an agreement with Apple to allow lawyers from each company to take depositions from employees. Schiller, who has recently stepped into CEO Steve Jobs' shoes to host several high-profile launch events, was deposed Thursday, according to Psystar's schedule. A week from today, its lawyers will question Bob Mansfield, Apple's senior vice president of Macintosh hardware engineering.

Others at Apple who have been deposed or will be next week include Mike Culbert, the senior director of Mac hardware; Simon Patience, who heads Apple's core operating system development; and Mark Donnelly, a vice president of finance at Apple.

"After numerous depositions of Psystar employees and associates, the shoe is finally on the other foot," crowed Psystar.

Apple and Psystar have been battling in federal court since July 2008, when over copyright and software licensing charges. Psystar struck back the following month in a countersuit that accused Apple of breaking antitrust law, but those claims were by U.S. District Court Judge William Alsup last November.