Well, it seems zimbra is going to be an amazing solution to our problem. We've already managed to work out our integration points almost 100%. My last and final question for integration etc... woudl be...

We'd like to have a zimbra web client popup in new window etc, and not have to have clients re-log in...etc. Can we pass a token, or users in a query string or cookies or anything? If so what would be the recommended method?

Thanks in advance again