Zentyal - turnkeylinux/tracker GitHub Wiki

Groupware and MS Domain Controller. MS Exchange compatible. AFAIK by default it also includes Samba4... See also SoGo

Links of interest

• http://www.zentyal.org/
• https://github.com/Zentyal/zentyal/
• http://doc.zentyal.org/en/installation.html - note that this mostly deals with installing the pre-built Ubuntu image, but does also touch on installing to an Ubuntu Server (which would be useful for installing on TKL)