The Google Email Uploader is a desktop utility for Microsoft Windows that uploads email from other desktop email programs (like Microsoft Outlook) into your Google Apps mailbox. The Email Uploader preserves information such as sent dates and sender/recipient data, as well as the folder structure used by the other email program. The Google Email Uploader requires a Google Apps Premier, Education, or Partner Edition account.

http://code.google.com/p/google-email-uploader/

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