I've installed Zimbra on a test server and have been playing around with it since yesterday. I'm trying to get it to play with Gmail and Google calendar, I would like to set it up so the user accounts are domain wide. So when a user logs in, they just use their Google apps credentials and it forwards them on to Google.

I know the Zimbra desktop can play with Google, but I want to configure this to be domain wide. Is this possible or am I barking up the wrong tree?