On Tue, 1 Sep 2015 at 15:49 <craig.luv@shakenautomotive.com.au> wrote:

Any suggestions? Or advice about the following? (must work with MS
Outlook)
ref:
https://www.linux.com/learn/tutorials/338482-microsoft-exchange-alternatives-for-linux
These two seem like the best fit so far..
* Zimbra
* Open-Xchange

Also have a look at Kolab.
http://kolab.org/

No idea what it is like to administrate, I haven't done so for several years.

They do have a cloud service, kolabnow, however latency from Australia isn't great, making the website clumsy to use at times.