Lawyers for the plaintiffs in the Vista Capable class-action lawsuit want to grill Microsoft CEO Steve Ballmer for three hours to find out what he said to top executives at Intel, Hewlett-Packard and Best Buy when they complained about the marketing program and its after effects, court documents unsealed Wednesday show.

According to documents the plaintiffs obtained from Microsoft, Ballmer talked with Paul Otellini, the CEO of Intel, and presumably with Mark Hurd, the chief executive of HP, about Vista Capable concerns.

Hurd had e-mailed Ballmer on February 6, 2007, just days after Vista launched, to tell him, "Our call lines are being overrun" with customers complaining about troubles upgrading to Vista. "I'm sure you're aware of this," Hurd added in the e-mail, which was quoted in a motion by the plaintiffs.

But much of the motion -- which opposed Microsoft's request last month to block the plaintiffs from deposing Ballmer -- was given over to discussion of the telephone conversation Ballmer had with Otellini in late January 2006, during the time that Intel was up in arms over the Vista Capable campaign and a requirement that would have excluded PCs using the company's 915 integrated graphics chipset.

"Despite the near panic atmosphere within Intel at the time, Microsoft would have the court believe that the telephone call between CEO Paul Otellini and CEO Steve Ballmer amounted to nothing more than a 'courtesy call,'" the motion said. "But this was not a spur-of-the-moment interaction between the two CEOs. Mr. Otellini had been planning the call for a week or more and insisted on making it happen to 'close the deal.'"

The plaintiffs' lawyers argued that Ballmer's testimony was crucial to their clients' case.

"What did Mr. Otellini say? Why had the issues escalated so far? How did Mr. Ballmer react?" the motion asked. "The only way for plaintiffs to know the answers to these and other questions is to ask the participants on the call."

Microsoft has asked US District Court Judge Marsha Pechman to block the plaintiffs' attempt to take Ballmer's testimony. In an October filing, Ballmer claimed, "I do not have any unique knowledge of, nor did I have any unique involvement in any decisions regarding the Windows Vista Capable program."

The plaintiffs' lawyers feel otherwise. "Mr. Ballmer's connection to the Vista Capable program is not limited to a single -- albeit significant -- telephone call with Intel's CEO," their motion read. "Mr. Ballmer was an active participant before, during and after the program."