enable API development for the latest exchange on-premise version (2019) and need properties like <SupportsSharedFolders> to enable Outlook Add-Ins on shared calendar

This functionality was the main reason we started using actionable items in emails. This allowed you to be able to switch back and fourth between the email behind the card and the card. Maybe it would be better to call it something like "See Accompanied Message".

Many users use Outlook as their E-mail client for multiple accounts, including non-Exchange accounts. The usefulness of Add-ins, and as a result Outlook, is greatly diminished if they can only be used with Exchange connected accounts. Please add support for IMAP accounts and Gmail to enhance the usefulness of Outlook Add-ins and expand the reach of Outlook in general.

Add-in only show on the email surface at the time of install through the App Store inside of Outlook Web, or using the Customise Actions pane in Outlook.
We want to show on the email surface without installing through the App Store, or using the Customise Actions pane. And also we want this when some administrator install the add-in for overall of its tenant.
This is important because Outlook for web users are difficult to find the add-in.

Allow an option to have all calendar invites to be a Teams meeting by default instead of needing to manually set it as a Teams meeting each time.

New Mac UI available from version 16.42 does not support Onsend Addin and Api requirement set 1.8 which is very critical for our DLP solution to work.

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

There is no setAsync method on Office.context.mailbox.item.body when reading a message. I'd like for a way to manipulate the body text from my add-in.

I do not want to alter the original message on the server.

Ability to open display form in current window without opening via pop-up/dialog window for :
displayNewMessageForm
displayReplyAllForm
displayReplyForm.

Will be great to have boolean parameter to manage a behavior.
This feature is good to avoid the issue with add-ins into dialog window for New Outlook UI
https://github.com/OfficeDev/office-js/issues/1438

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Currently you can specify if an add-in is pinnable or not. It would be nice to also be able to specify a default value for that state, whether its pinned by default when opened or not.

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Outlook for Mac supports this - https://developer.microsoft.com/en-us/office/blogs/announcing-add-in-support-for-gmail-accounts-in-mac-outlook - but Outlook for Windows Desktop does not

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We are building an outlook webapp add-in, and based on the user preferences trying to change the outlook read/compose surface commands icons (dark mode support). Request outlook team to look at this feature.

This functionality is not exposed by the UI in Outlook for Mac.

However, this would be very useful for services that need to maintain the state of meeting responses, including conferencing services. At present they can see meetings at point of creation, but only the original human sender sees the replies from invitees.

Email messages have access to the internetHeaders attribute, but meetings do not, so as far as I can tell it's not possible to specify Reply-To for a meeting.