I would love to have the ability to create macros in Outlook for Mac. For instance, to create a macro that will allow me to schedule a Skype meeting using my own meeting id.

allow sub tasks within a task

It seems crazy that a task on OneNote doesn't sync to outlook and/or planner - surely we can have one list of tasks across all office applications

Create Add Project (similar to a task) that users can create/add tasks to.... either "User defined" tasks or "emails" flagged as tasks.
I suspect there are a lot of users who would pay for this addition.
Collaboration feature would be great. Like combining MS Teams with Outlook

Can we please have access to the separate identities in Outlook, the same way Entourage used to? At start up you had a small menu giving the choice which identity you wanted to see. Then if you wished to change identities again, there was a 'switch identity' button under the 'file' menu that brought up the same small menu.

Having to go through the outlook profile manager to reset the outlook default identity every time is very inconvenient!

in my company we had lotus notes. we had a great way of adding to tasks emails. especially the guys following the GTD way of organizing tasks. now we passed to outlook 16 for mac and it looks impossible to drag an email into a task and it makes my job much more difficult. is there a way around?

I am quite puzzled that it seems to be impossible at Outlook for Mac (v 15.41) to collaborate on tasks or even only display tasks sent from other Outlook users (using the PC version).

Please allow mac user to assign tasks on outlook, it is a huge inconvenience for those of us who have to work on outlook on a mac

In the task list, when I update a category or followup date, it automatically moves it to the next task. I don't want it to move forward until I'm done updating multiple items on the task. I keep having to click back on the task.

Just need to be able to group, expand/collapse the tasks list like you can in the Windows version. As soon as you get past a screen full you can't manage the list properly.

Need the ability to assign tasks to others

Feature already exists for the Windows Outlook client. Frustrating for those of us who use both operating systems in the course of our business day to have some features available to us only on a given OS.

When creating a task, have an option where it will always have a reminder/alert associated with it.

Add attachment support for calendar items and tasks. Also it should be possible to easily create a new task or calendar item with an email as attachment.

Add support for Tasks when using Gmail/Google Apps

On the Windows based version of Outlook, you can drag and drop emails to either the calendar, tasks, or contacts to create new items. The subject of the email becomes the calendar or task subject and the body of the email goes in the notes field.
Bring this functionality to the Mac version so that drag and dropping of emails works to other areas of Outlook.

In Outlook for Windows, you can select multiple Tasks in the Task List, click Copy, then paste the list into another tool (e.g. Excel). Doing this is really handy for quickly generating a list of tasks to save or send elsewhere.

Ability to add subtasks nested under each parent task, that can be shown or hidden, and individually completed/checked.