Phil Johnson estimated the damages suffered by Novell arising from alleged anticompetitive acts committed by Microsoft in the workgroup operating systems market. During the 1990s, Microsoft’s Windows NT product made market share gains largely at the expense of Novell’s NetWare product. Dr. Johnson created and analyzed various but-for scenarios that reflected the impact of Microsoft’s alleged behavior on the sales and profits of NetWare. He presented his analysis and damage estimates to Microsoft, rebutted the work done by Microsoft’s experts and assisted counsel in the mediation and subsequent settlement discussions. The parties agreed to settle the matter with Microsoft paying $536 million to Novell.