Luckily, you don't have to look far! Here, learn more about what it means to go through a "Go Live," study up on some of the verbiage surrounding the migration, and manage expectations for the weeks and days leading up to the transition.
Can't find the answer you're looking for? Before you reach out to help desk, try Googling it - Google is great at its own support documentation.
Why? This will help ensure that you receive all new incoming mail after the migration begins.