In the current version of Outlook for Mac, users can create folders "on my computer" to organise/drag/drop specific emails into. This functionality is not currently working in New Outlook for Mac.

Please give us the option to turn off seeing Sent emails in conversation view. I can't stand seeing sent emails in a conversation view. If I want to find a sent email, I'll go to Sent Folder.

Add color coding for Mail account list to easily distinguish between multiple email accounts

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

"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.

The new Outlook client seems to be limited to syncing six months of email. I can't find the sync limit anywhere. I keep switching between the two Outlook clients depending what I am searching for.

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

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

Like Spark Mail, or Canary Mail, the ability to color code email accounts. Would appear color coded in left nav bar and also with an indicator in email list.

Why? Makes it real easy to see what account an email came in to.

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.

The web based outlook.com and the windows version of outlook 2019 and 365 both support alias support. Only the mac version does not support this. It would be very useful if such support was added.

Allow Embedded Outlook Messages (.msg files) to be opened in Outlook for Mac. Colleagues regularly forward embedded emails that I can't open

Add support for voting buttons.

Not able to sort by Flag - clicking on column does not work, menu option is not there

Just like on outlook.com it would be nice to be able to pin messages at the top of folders and sync whatever message you pin in outlook.com to also pin it on the app.

It will be very useful to integrate a button that, while replying to a mail, send a message and archive all the thread.

Ability to add columns such as Message Size. My organisation has strict quotas so its handy to be able to delete large messages

I like having the left sidebar collapsed as it reduces wasted screen real estate. However, I occasionally need to access other folders like Sent, Archived, etc which means I have to collapse and expand this sidebar every time to see those items. It would be great to have another method of switching folders while keeping this sidebar collapsed.

Note: this should also apply to calendars, people, notes, and tasks.