The Xperia made a big slash when it was released in the early part of 2009. It marked a new direction for Sony handsets, most notably, a departure from the Symbian platform. The X1 runs on Windows Mobile 6.1, but uses a highly customized shell of panels. Each panel has a variety of uses, some lend to increased productivity while others remain perfunctory. Regardless of their utility, this new UI is extremly interesting, and something I wanted to revisit, especially with the pending release of the X2, which will help modernize the platform, but keep the same UI principles.