So the Davmail contact sync, based on LDAP, was syncing with an empty list. Instead of using the “global address list”, they created a specific list of contacts (name “Company contacts”, with a space). I had some troubles regarding the access to contacts since the structure used by the Exchange server in my company was not “usual”. Since this concerns only a few calendars that are not important to me, I did not pursue it through. I did not follow through on this aspect but even today there are some calendars that I can actually open, but nothing shows up. To access other users’ calendars, I used the following my installation notes, I noted “initial request for access to a shared calendar has to be done by Outlook, otherwise no access”. The tutorial from Davmail is very well done: Since then my company upgraded to Office 365. My company had a reverse proxy to access the exchange server (). I document here my specific case, in case it may help anyone.

Exchange 2010 EWS mode with unsupported authentication form e.g.

There are different versions of the path, depending on Exchange versions: DavMail must be able to find the authentication form at the provided URL.

The path depends on Exchange version and configuration, with or without a reverse proxy. You will need to identify the correct Outlook Web Access URL to access the exchange server, i.e. Once downloaded and installed, you will need to configure it. There are actually quite a lot of resources on Davmail website, so I wont duplicate the information. Prerequesite: your exchange account needs to have “OWA” (Outlook Web Access) activated There are still some issues, but works “mostly”. Any email client (Evolution, Thunderbird) with Davmail gateway: the solution that I’m currently working with.Thunderbird client (windows, linux) with ExQuilla addon: this is paid solution, I have not tested it.Requires linux obviously (not suitable in my work environment). Evolution client (linux) with evolution-ews plugin: I have this configuration working on a linux machine, however it’s not as powerful as Davmail regarding the access to shared calendars (in public folders, see below).

This only works for emails, not for accessing shared calendars

Using any email client in POP3 or IMAP.

You cannot stand outlook? Want to use a free (as in Freedom) email client, while your environment is 100% Microsoft exchange? Here are some options…

Thunderbird 365