Stefan Kulms

provide web add-in support for the new Outlook for Windows

Are you aware of this? COM Add-ins will not be supported in the new Outlook for Windows but will continue to work in classic Outlook for Windows. https://techcommunity.microsoft.com/t5/outlook-blog/add-ins-in-the-new-outlook-for-windows/ba-p/3954388

Is there already a release plan for a version which supports web add-ins for Outlook in Windows? citation from https://techcommunity.microsoft.com/t5/outlook-blog/add-ins-in-the-new-outlook-for-windows/ba-p/3954388 In the new Outlook for Windows, web add-ins are fully supported, with no additional work required from partners. COM Add-ins will not be supported in the new Outlook for Windows but will continue to work in classic Outlook for Windows.