Google is currently offering schools a hosted solution for their email, calendar, and chat through G Suite for Education, our integrated communication and collaboration solution. Additionally, you can complement the core suite to meet your users' needs, with access to several more Google services.
From Google: G Suite for Education is free. We plan to keep the core offering of G Suite for Education free. This offering includes user accounts for future incoming students. As you may know, Google was founded by a research project at Stanford University, and this is just one way we can give back to the educational community.
To see the available features included in G Suite for Education, visit the G Suite for Education homepage.