Shared contacts and calendar for windows clients

[sitedesign]

I am looking for a simple groupware system for windows clients using an Ubuntu Server.

The clients are running windows for now. They can install any client required.

I have set-up an Ubuntu server for them.

They want to have shared contacts mainly with possible shared calendars.

Is there a simple way of setting this up?

[at0mic]

yes. openldap is used for this. i set this up at work

https://help.ubuntu.com/community/OpenLDAPServer

u use ldap with apps like outlook

[druhboruch]

Have a look at Zimbra and Scalix
www.zimbra.com
www.scalix.com