Outlook Add-in VSTO: Ribbon Type property is not shown
问题 I am a new VSTO 2015 user. I want to add a custom group to the Outlook 2010 built-in Ribbon message tab. I followed a Microsoft example. After creating the project I added a new Item and selected the Ribbon (Visual Designer). The ribbon shows up in the designer however I cannot see the RibbonType property in the Ribbon’s property window. Therefore I cannot select the Microsoft.Outlook.Mail.Compose that will allow me to add the custom group to the message tab. Your help is highly appreciated.