[nwh]

I've been researching doing this for a while, but there's one big caveat that I can't get past- there's no decent server solutions for push mail. For desktop computers there's IMAP IDLE, but all the push solutions Apple's software uses are based on Microsoft Exchange (expensive).

I'm all ears too.

[corford]

Zarafa works wonderfully and is a snap to setup.

Edit:

Here are the docs for the latest 7.1 branch: http://doc.zarafa.com/7.1/

And here is the link to the community (open source) section of their site: http://community.zarafa.com/

[nwh]

I keep hearing the name. I'm going to chuck it onto a VM and try it out.

[corford]

I'm running it on two small sites (< 50 users each) and it works as advertised. The nice thing is, it isn't monolithic - you choose the MTA and web software (in my case postfix and apache) and it uses mysql as the backend.

The webmail interface is the best opensource one I've come across (easily beats redcube) and active sync works fine with iphone 4/5 and android.

[corford]

lol freudian slip! Redcube should have read Roundcube :D