Is it possibile to create a custom control in outlook which can be placed in the middle of an application? I mean sommething like this:

I know it could be done with the WebViewPane with Add-in Express but can it be achived without buying this product?
Maybe someone has seen some articles about writing sommething like that?
As far as I know this feature is not supported by Outlook API.
Products as Add-In Express, btw, can do it by using unofficial and unsupported hooks.
There is a project here that you can look at in order to do the same by yourself. It is an open source project from Microsoft that provides you some kind of API on top of these unsupported hooks.