I use DavMail
to provide IMAP or POP which you can use with a client like
Thunderbird
(for mail and calendar, though the latter doesn't work perfectly).
The davmail website gives instructions on how to set things up. Important
is that the address of the Exchange server is https://weboffice.han.nl/owa/
(you may need to excape the colon). You can either run the graphical program
as a normal user; I use the daemon that starts whenever I boot my laptop
(a few times a year, though the connection is sometimes halted so that I
need to restart the DavMail daemon).
GUI mode
Follow the instructions on the website under
Linux setup.
Daemon mode
I had to set
davmail.enableEws=auto davmail.url=https\://weboffice.han.nl/owa/ in /etc/davmail.properties and start the daemon.
weboffice.han.nl/ (w.o. https:// and/or /owa/ seems to give fewer/less severe errors
Autodiscovery tries https://autodiscover.han.nl/autodiscover/autodiscover.xml, asks for a password, gives no error, but I can't continue (Next button greyed out)...