Ok here is our situation, we manage a group of users here on our campus of around 200 running Exchange/Outlook. A different group on campus uses Zimbra. We have a small group of staff that works back and forth very much with the Zimbra users on campus. We need away to share calendaring back and forth between the two. An ideal situation would be to be able to open outlook and be able to view the shared Zimbra calendar from the other user some kind of way. Is there anyway this can be acheived?