Two years ago, together with Matias Woloski we wrote the Outlook Bar for the Composite Application Block (CAB). I can say that it was a popular workspace, with more than 19,000 downloads!. Now that we shipped CompositeWPF (Prism), some people at the CompositeWPF community started asking for the OutlookBar for CompositeWPF, so Julian Dominguez, Matias Woloski and me decided to spend some time and create the Composite WPF version.
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