Have you checked out Exchange EWS Provider [1], currently maintained by Ericsson? This has been around for a few years [2], and when the developer could no long

Have you checked out Exchange EWS Provider [1], currently maintained by Ericsson? This has been around for a few years [2], and when the developer could no longer spend time on it, Ericsson took it over. The extension is not perfect, but you can get some stuff done. Another alternative is the DavMail gateway [3], which runs as a separate (Java) program that sits between your Exchange server and Thunderbird. [I haven't used this one for years ever since the Exchange EWS provider became available] [1]: https://github.com/Ericsson/exchangecalendar https://github.com/Ericsson/exchangecalendar [2]: http://www.1st-setup.nl/wordpress/poducten/exchange-ews-calendar-and-tasks-add-on-for-thunderbird-lightning/ http://www.1st-setup.nl/wordpress/poducten/exchange-ews-cale... [3]: http://davmail.sourceforge.net http://davmail.sourceforge.net