Allow Outlook Add-Ins to work with custom forms
When trying to convert an existing solution from Outlook custom form + COM Add-Ins to a mail-app Office-Addin we cannot get add-in commands to work on items of our custom form.
Please understand that this makes it hard or impossible to support the new Add-in model when coming from a currently working solution built on older extension technology.
Please allow to use Add-ins on items with custom forms.
It would be okay if we have to state that explicitly in the Add-in manifest.
Gary Cawley commented
Allow Outlook addins to fire based on the message class (custom form name) of the item.