Replacing part of Outlook client's window with a custom form
问题 I am developing a VSTO application for Outlook client. I am trying have my form open in the part of the Outlook client window which is highlighted in red in the following image: I think I can't use the form regions because they replace the view for a single item. So basically what I want to do is opening my custom form (windows or web) in the red area when I click my tool's button on the toolbar. Any ideas how this can be done? 回答1: There are three main ways for displaying your own form there