As Microsoft works overtime this week to get developers and consumers behind its next-generation Windows operating system, focus shifted back to the company’s emerging mobile platform briefly on Wednesday, AllThingsD reports. Speaking at an analyst meeting, Microsoft CEO Steve Ballmer addressed sales of devices bearing the Windows Phone operating system, acknowledging that the company isn’t where it hoped to be nearly one year after launching the platform. “We haven’t sold quite as many as I would have liked in the first year,” Ballmer said, noting that the company is making progress and that exciting new features are in the pipeline. “I’m not saying I love where we are but I am very optimistic on where we can be. We’ve just got to kick this thing to the next level.” Ballmer continued, stressing that Microsoft’s partnership with Nokia will help carry the platform forward. “With Nokia we have a dedicated hardware partner that is all-in on Windows Phones,” Ballmer told analysts. “They are not doing something on Android or [any other operating system].”