Exchange Server Replacement
 

I'm looking for some recommendations to replace M$ Exchange Server. I'd like it to have the same features as Exchange e.g. Email, Calendar, Contacts, Tasks and can sync with Droid devices or more specifily TouchDown. And be free since it's only for a home based network.

Much thanks.

Zimbra would be a fairly safe bet http://www.zimbra.com/products/download_opensource.html

Thanks for the info. Do you know if the open source addition includes updates to the SPAM and antivirus signtures? The website says it doesn't include support or software subscription but was wondering if it would still include AV/SPAM updates instead.

Thanks...

EDIT: My bad... did a little digging and found out it does include them.