ThinkPad its 1992 launch to keep the Harvard Business School happy. In April 1992, IBM announced the first ThinkPad tablet computer at a news conference. The first ThinkPad tablet, a PenPoint-based device formally known as the IBM 2521 ThinkPad, was positioned as a developer's release. The ThinkPad tablet became available for purchase by the general public in October of the same year. In addition to giving it an innovative name, IBM marketed the ThinkPad through imaginative activities such as early customer pilot programs, numerous pre-launch announcements, and an extensive loaner program designed to showcase the product's strengths and weaknesses. IBM even
ThinkPad An 11.6" Edge 11 model was offered, but not available in the United States. The S Series is positioned as a mid-range ThinkPad offering, containing ultrabooks derived from the Edge Series. As of August 2013, the S Series includes S531 and S440 models; their cases are made of aluminum and magnesium alloy, available in silver and gunmetal colors. The Lenovo ThinkPad Twist (S230u) is a laptop/tablet computer hybrid aimed at high-end users. The Twist gets its name from its screen's ability to twist in a manner that converts the device into a tablet. The Twist has a 12.5" screen and