It is way too easy to "un-Star" a favorite.
please make me confirm that I meant to un-star a favorite.

Currently I create rules on the computer that I'm working on but these do not sync between multiple machines. Being able to either add to iCloud and sync with all accounts or even just export the rules to manually add would help

Inline mini translator for Office 365 for Mac. Similar to what you have for the windows version.
The ability to select text in the mail and a hover box appears with the translated text.
I am English speaking living in Germany so this is vital to my productivity.

I occasionally receive emails related to production support tasks which must be acted on immediately. I'd like to be able to create a rule to play a custom sound when I receive one of these emails.

Since I can use rules to mark them high priority, another option is just having a different sound for high priority emails.

It would also be nice to have an option to always play this kind of sound over my system speakers. That way if I'm not wearing my headphones or I step away, I can still be alerted.

I would like to be able to add a room onto a meeting that was created by someone else. It would be useful when a client invite us at a meeting and we have to regroup in a meeting room.

Show Unread Message count next to Smart Folders, the same way it shows up for all other folders. The use case here is that I've created smart folders for mail in my Inbox that is from key people (one smart folder per person) that I need to prioritize. When new mail arrives from one of those people, I need a visual queue that a new message has arrived from that person.

I have two companies I’m working for and often when I’m writing a new email, it is being sent from the wrong domain and i accidentally send emails meant for coworkers at one domain from the domain of a different company. It’s dangerous. I'd like to separate address books so when I’m writing an email from domain X, it doesn’t pull up the addresses associated with domain Y. In a hurry I'll make the mistake and the damage is done.

Allow the "Move To" folder picklist to be longer than 10 folders.

Like windows we need to option to view the OLM files , In windows it can be done just using the Outlook menu : File ->open and export -> Open outlook data files (.pst)

Exchange has a feature called Message classification which displays a classification on an email in Outlook. This function works properly on Outlook on Windows, but does not function on Outlook on Mac.

The dial in number for Teams meetings are not in the quick-look for either the MAC client or the iOS client. Please add it.

In general, simplify the UI. It is so visually busy I immediately get overwhelmed and want to close the program. I am so close to reverting to Mac Mail and Calendar. I really hate it.

Respect "do not disturb" by discontinuing notification sounds when it is on.

There is a lot of padding/empty space with the folder view, reading pane, and schedule view on mail. I frequently resize the folder and schedule panes so that the reading pane fits the full message (messages are not being resized to fit the reading pane). But if I switch to the calendar view, once I go back to mail the sidebars are reset to their original width.

Click "dismiss" and continue working in the same application I was using before Outlook took over. If I do this, then I have been reminded. Unlike today, where I dismiss a reminder, Outlook moves to the foreground (for some unknown reason), and I must move it to get back to my work.

Are the Business Central Outlook Add-Ins "Contact Insights" and "Document View" also working in Outlook for MacOS?

The calendar notifications are painful to work around due to their large size, which cannot be made smaller. The meeting/appointment name text size is overly large and leads to not be able read much. Please decrease general text size, decrease window size to have a smaller hight. If possible the window to be almost transparent. Or enable settings in preference to choose between default or smaller, etc.