Dialog window has to support add-ins for the New Mac UI
Our clients are using new Outlook design 16.42 (20101102)
Our Add-in uses functions: reply/replyAll/forward they open Dialog window(pop-up) and this window does not support add-ins.
This is really critical issue, because our clients use pinned panel of add-ins to complete their workflow.
https://github.com/OfficeDev/office-js/issues/1438

1 comment
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Anonymous commented
Yes, it's shocking that MS releases new GUI features without backward compatibility for office addins. Please add this asap!