If you're switching to Gmail from another email provider like Yahoo!, Hotmail, or AOL, Gmail has a handy tool to help you move over your old emails and contacts. This tool is now accessible to Google Apps users as well.

Note:
This import feature is not a Google Apps core service and is not supported under the Google Apps Terms of Service.

Editions included:
Google Apps, Google Apps for Business, Government, and Education

For more information:
https://support.google.com/a/bin/answer.py?hl=en&answer=2525613
http://support.google.com/mail/bin/answer.py?hl=en&answer=164640

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