For local email transfers look to our partner Weird Kid Software and their product Emailchemy. It will help you take your emails out of Outlook and convert them into a more accessible format. It's also worth noting that Emailchemy can read most email formats on the market and that it runs on most platforms (including Windows, Mac OS X and Linux).
If you're moving to Google Apps, you should really check out our partner LTech. They offer a wide range of products that utilize Google Apps' API. Some of their most interesting products include:
- CloudMove - A migration tool to migrate documents from Microsoft SharePoint to Google Apps.
- Power Panel - An extension to Google Apps that simplifies administration and adds a shared address book.
- Calendar and Contact Migration - Two tools which enable server-to-server migration from Microsoft Exchange to Google Apps.
(Please note that all of LTech's tools are Windows-only and may require Google Apps Premier or Education Edition)