"I'll be working on challenging projects that span the entire Windows product line and directly influence subsequent generations of the most important operating systems on the planet," he said. "From security to virtualization to performance to a more manageable application model, there's no end of interesting areas to explore and innovate."
The other co-founder will also be working with Microsoft as a Software Architect. Most people see this as a positive thing, and it's hoped that the talent they have will be put to just as much good use as it was with Winternals. Anyone who has spent time in a repair shop or in an Admin position probably has found their software useful at one time or another.