There was supposedly a webcast recreate the Outlook interface using
Expression Blend, but unfortunately it was taken down before I had a chance
to see it. Possibly a hoax? Or maybe someone decided it was too good a
I've been learning WPF by building my own Outlook clone. But mine actually talks to the Outlook COM API and is centered around the XAML and class library. There is more explanation of how to truly create the TreeView items against a data source, and more in-depth detail around the GridView (expand/collase groups, grouping, calculated groups, etc). It's worth a look see.