PowerSchool, a wholly owned subsidiary of Apple, last month released PowerSchool SIS 3.7, the latest version of the Web-based, Mac and Windows compatible student information system for K-12 schools and school districts. The update is the result of the company’s renewed focus on stability, quality and the desire to add “innovative features rather than just looking at what’s going on in the rest of the market,” PowerSchool President Bob Longo told MacMinute.