Please get rid of the pop ups notifications and switch to the native macOS style notifications.

It would be helpful to either completely move, or at least add a send button to the top bar when composing an email. When all of the actions except send are at the top it seems quite odd and confusing to have to go to the very bottom to actually send a message. Another idea is to possibly shrink the composure box so it isn't so far away.

After pressing the tab key to go out of the Subject field of a new email, please focus on the body of the email, not the Font and font size.

Current tab-key sequence: To --> Subject --> Font --> Font Size --> Body
Suggested sequence: To --> Subject --> Body

"View Source" was an important tool for looking at the source (headers, body, servers, etc.) of a received message. It was in the context menu (right-click) but is no longer there. I could not find it in the menus either.

Ooops - did we lose the 'Resend' option for sent messages?

When sending an incorrect email add the ability to recall that email from all recipients as is possible with Office for Windows client.

There is no easy way to toggle the Sidebar, when extended/open, you need to go to the view menu but once collapsed/closed. there's a nice icon to extend it again.
This icon should always be visible to the user.

With the New Outlook for Mac, you seem to have removed the functionality to right-click on an email and set a reminder/flag/due date for a mail item. Can you please return this functionality? I found it especially useful for items that I could not act on at the moment but needed to follow back up with.

Literally can't even use the new Outlook now since we rely on this

Please update the search function and add the "search all mailboxes" function again. Search should also be automatic, no enter-hitting.

I know I can tap in open in new window, but having to press it everytime is tedious and prone to mistakes

With the new Outlook i'm not allowed to drag and drop e-mails from one mailbox to another and thus making a copy in that mailbox and folder.

Outlook for Web condenses the conversation nicely; expanding only the most recent message and giving a preview of the others. You can then expand each previous message separately if you need more context.

I LOVE the Outlook web app and want it as a native macOS app.

Right now all sub-folders including sent items show up by default making it very long list for each email.

Skype integration into the meeting creation tab was one-click and easy to do.

In Outlook for Windows I can add a send delay to every message as a rule. I like doing this because it gives me an extra minute or more to change my mind about an email after clicking 'Send'.

The web version offers a 10-second delay, which is even better than nothing.

Add support for voting buttons.