Yesterday Microsoft CEO Steve Ballmer provided the opening remarks at the Worldwide Partner Conference (WPC 2013) day one keynote, taking the opportunity to hype Windows 8.1 and sell the benefits of Windows Phone. He started the half hour keynote by thanking the 15,000 attendees in the room for their support and for taking care of Microsoft's customers, before getting on to the subject of the company's divisive operating system. "Windows 8 was nothing short of the most remarkable re-platforming of Windows, basically, since 1995", Ballmer said. "And we've gotten a lot of feedback on Windows 8. I think we did a heck of a good job on Windows 8 and we're going to spend a lot of today also talking about Windows 8.1. Because we listened and we learned, and as good as Windows 8 is, I just encourage you to really take a look at the Windows 8.1 demo.