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.
Trouble logging in? Simply enter your email address OR username in order to reset your password.
For faster and more reliable delivery, add firstname.lastname@example.org to your trusted senders list in your email software.