[Optional] Migrate user data
We have admin tools for migrating email, calendar, and contacts from Exchange and Lotus Notes to Google Apps. For schools using other legacy servers, such as GroupWise, we also offer migration over IMAP, POP3, and a suite of APIs.

For an overview of the migration tools Google offers, see chapter 5 on Mail Data Migration and chapter 7 on Calendar Migration in the Google Apps Technical Transition Guide (PDF).