It currently only works with Office365, and Google accounts.The 2 biggest issues with the latest preview of Outlook for Mac are: It also gives some insight into the direction Microsoft is moving, and that direction itself is somewhat disturbing and may have people thinking twice if they want to continue using Microsoft's email clients. And just as there are some issues with the Big Sur BETA that Apple is working through, the preview of Outlook has some glaring, and extremely alarming, changes that will affect any user of any on-premises email server. The ongoing BETA of the next version of MacOS, Big Sur, comes with the bonus of a preview of the upcoming Microsoft Outlook for Mac.
