Thanks bill, and sure, it's not that brilliant to post on old threads, but i think it covered the subject quite well..
I just brief went throgh the posts you gave me, but it seems they all are about migration, which is not the case for me.
I want a coexisting mail-enviroment with Zimbra, not migrating the old Notes people to Zimbra.
But still i need the free/busy functionallity to be inter-operational for both enviroments.