There are loads of people who want this very basic functionality. Yet, if you search on the subject, despite the requests going back ages, the response from Microsoft is in the range from ludicrous (reset your whole PC) to you are only a customer, why would we want to meet your needs, obvious though they may be.
This is an example of the blindingly obvious in functionality terms. If you live in Outlook desktop you want to share using Outlook desktop. Not some cut down mail program which, if you enable it with your accounts, will clutter up your storage with second copies of your messages.
In my naivety I used to think that a company provided forums (for a) such as this to not only enable self help but also to pick up and respond to user needs. How wrong can one be? The people in Redmond appear to be too busy training themselves to shoot their own feet to bother with mere users.
In my opinion, this mess is the legacy that Steve Ballmer has left, a place where divisions don't work together, everyone is out for themselves, and the user suffers. I guess I'm glad he is gone and this new guy is there to reinvigorate a once-great company. I know it will take some time.