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Log in to your Google Apps account
Go to:
http://www.google.com/a/your_domain
...in any web browser and enter your existing your company name user name and password.
The first time you log in, you'll be asked to take a moment to set up your account.
Watch this quick intro to Google Apps
Video (3 min): A high-level introduction to Gmail, Google Calendar, and some of the other new apps you'll be working with.