Two engineers from Microsoft Switzerland, Ronnie Saurenmann and Ruihua Jin, have put together this 90-page hands-on lab that takes you through the process of building a business application that has the same UI as Outlook 2007 using Expression Blend.
You can check out the xbap, read the hands-on-lab manual, or look at the source.

More details on this here:

• Tim Sneath
• Sascha P. Corti

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