FirstClass® Client FirstClass® enables you to experience the power of reliable communication, collaboration, conferencing, and calendaring capabilities in one easy-to-use solution.     The FirstClass® Client software provides a desktop application that is optimized for fast, streamlined access to the FirstClass® server. Choose the version you want to install. Mac OS 9 & X or Windows or Linux or FirstClass® Plugin for Microsoft Explorer for Windows® IMPORTANT! If you were directed here from the Student Orientation, then this page has opened in a new window. When you have downloaded and installed the FirstClass Client and successfully signed in, you must return to the Orientation page that sent you here and click on the link to Step 4: Email Instructions. That link can be found at the top of the page: