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Google has released the Google Apps Email Migration API, which allows users to migrate email from their servers into Gmail. This follows the addition of IMAP support to Gmail last month. For corporate users, where Microsoft Outlook is still the norm, this makes Google Apps a far more viable option.
On the Google Enterprise Blog, Product Manager Gabe Cohen explains one solution already built using the API:
“For example, using the Email Migration API, LimitNone has already built a tool called gMOVE, which can move Microsoft® Outlook® calendars, email and contacts into Google Apps.”