The only thing CEO Steve Ballmer knew about Microsoft's Windows Vista Capable marketing campaign was what he was told by subordinates, and he should not have to testify in the class-action lawsuit that accuses the firm of deceiving customers, the company said Friday.

In a motion filed Friday, Microsoft asked U.S. District Court Judge Marsha Pechman to block the move by plaintiffs' attorneys to depose Ballmer later this month. Lawyers for the plaintiffs want Ballmer on record in the case, which charges Microsoft duped consumers when it touted then-current PCs as "Vista Capable" in the months leading up to the late-2006 launch of the new operating system.

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