I had the pleasure of helping to redesign the Windows 8 Pro website for Microsoft and make it mobile-friendly. Working with another designer from Metia we mostly leveraged the existing page designs and provided layouts for each of the 5 screen sizes, from desktop to tablet to phone. We did redesign a couple of the pages and restructured and consolidated the New Windows section to improve page consumption. HCL did the dev work.
http://www.microsoft.com/en-us/windows/business/