Our WinForms suite offers RadPageView which supports Outlook style. Form more information, please refer to this article. Please note, however, that RadPageView can't be collapsed to the left edge like this is done in Outlook. Our WPF suite supports collapsing and in my previous reply I have given a link to an article which describes how you can use WPF controls in a WinForms application. However, as I also mentioned, we do not recommend this approach, because of the complexity and the issues that may appear because of the integration of components in a platform that is not native for them. So, I would suggest using RadPageView instead of the WPF OutlookBar.
I hope this helps.
the Telerik team
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