Outlook 2010 and lower - IMAP/POP only Outlook 2013 - ActiveSync for now (MAPI coming for SmarterMail 17) Outlook 2016 - ActiveSync for now (MAPI coming for SmarterMail 17)
Outlook for Mac supports EWS as does Apple Mail. eM Client for Windows / Mac also supports EWS.
For anything lower than Outlook 2013 will be IMAP and POP only unfortunately. https://caldavsynchronizer.org/download-2/ is an option to sync calendar and contacts for older Outlook versions.
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