High Quality Content by WIKIPEDIA articles! FirstClass is a client/server groupware, email, online conferencing, voice/fax services, and bulletin-board system for Windows, Macintosh, and Linux. FirstClass`s primary markets are the higher-education and K-12 education sectors, including four of the top ten largest school districts in the United States (Las Vegas, NV`s Clark County School District, Florida`s Broward County Public Schools, Hillsborough County Public Schools, and Chicago Public Schools).