As a stand-alone client, it's acceptable (although it has some very non-macOS UI choices that annoy), but when working in a MS-centric work environment it has so many fewer basic features than the Windows version of Outlook that it makes collaboration difficult, and IT support an utter fustercluck.
The OWA UI offers a better experience IMO, and as MS has stated that it will form the UI basis moving forward for all clients, consider using it (where possible) a sneak peek of what's coming down the pipe later this year.
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