Outlook is the client of Exchange , it can do smtp,imap,pop3 too
its sold as a solution, with os , server, auth system ,client , support people etc
and that solution - as a common example - doesn't work.
There is no reason for M$ to make Qutlook fit in a perfect imap client cause this would goal in less reason for exchange
as well as it's own product.
But it is by design, as more money can ge acquired by constantly servicing non working product.
Nevertheless if you have good admins and money to buy licences and good support, outlook and exchange are good company solutions for intranet mail and groupware ( like calendering etc )
Show me working case. i would like to see it :)
Still - it have nothing to Dovecot and Dovecot, no matter how great would be, will not improve it.
"Tweaks" can overcome some bugs or deficiences but not whole product.