Have Outlook added to the 'share' menu (under Extensions) in System Preferences. It's time-consuming, and annoying to constantly have to drag files to Outlook — as opposed to being able to sending them via Outlook under the 'share' option. This is a must for businesses, that email a lot of attachments. Thanks.

Indentation is not enough for quoting email text. Not having a clear character as ”>“ (as plain text standard) or “|” (as apple mail) holds me from using Outlook on my Mac. Although it is a really goog email client.
Come on, please!

Add ability to snooze messages (i.e schedule messages to come back to the top of your Inbox). Many modern clients support this and it is actually already part of Outlook for iOS. If added, this should be available to use as one of the swipe gestures.

We would like to have an option to create a rule to delay all outgoing email, like in Outlook for Windows.
Thye idea is to have a small time to cancel the sending if there is something wrong.

You can delay individual messages, but you cannot add a rule to "auto-delay" X time any email you send.

I just updated to the latest version of Office for Mac that support Dark Theme in MacOS Mojave. I like using Dark Theme and am excited that Outlook is joining the team, but I am disappointed to see that the reading pane is still in light mode. It is jaring to see the reading pane next to the rest of the program. Is there a way to make the reading pane be dark as well?

Add support for digital signature and encryption certificates located on smart cards.

Extremely bad for searching.

Would like to have the iOS "send availability" & "defer (scheduling) email" features in Mac version. Currently, the iOS features do not appear to be available in the Mac version.

If an email is assigned a category and that email is used to create a task or meeting, then the category should still be attached to the task/meeting.

For legal purposes I need to save all emails pertaining to specific real estate transactions their respective FOLDERs in Documents on my MAC. I then download them to a thumb drive and save them for 7 years, as required. About 3 years ago that capability disappeared and I've been stuck ever since.

I use iOS and macOS outlook, it would be great if the Apple Handoff API was used so I could start a mail on the phone and finish on the mac.

For my corporate email, I use outlook.office.com, Outlook for Mac, and Outlook for Windows, and Outlook for Android.

I love the web client's ability to "pin" important emails to the top of my inbox. Since this feature is not supported on any other client, I end up using both the web and desktop clients throughout the day. It is very frustrating!

Ability, once responding to a mail, to toggle 'reply' or 'reply all'. Save copying and pasting once you realise your mistake or change your mind...

Mac version of OLK misses option to force mails to be read initially as plain text. Active content and dynamically downloaded content expose to security threats. Users and SysAdmins should have option to limit attack surface.

Ref. https://twitter.com/5ean5ullivan/status/1002451004883861504?s=21

There is an annoying feature that appears for some emails- an "Unsubscribe" button that appears below the sender-subject-retention policy header. I'd like the option to turn this off or remove it.

Sometimes we need to quote from one email to send to someone else. Give me an option to copy or paste as a quote so the quote indent and attribution follow the text, rather than trying to either make that manually, or to create a reply then copy that into a new message (eg when trying to collect separate quotes from separate responses into one message).

Please add stationery to Outlook for Mac (the same as in Outlook for Windows). It is a useful yet often overlooked feature.