I have 2 forests, each with one domain and its own Exchange 2003 server. Sharing calendars is simple in the same domain but what about cross domains? Is it possible to have a user from Domain1 share the calendar of a person in Domain2 and where would I look for information on how to do this, if possible? Thanks!

Have a look at the Inter-organization Replication tool, which allows you to share free/busy information between separate Exchange orgs. http://www.microsoft.com/downloads/details.aspx?FamilyId=E7A951D7-1559-4F8F-B400-488B0C52430E&displaylang=en Tony www.activedir.org

Yes, I'm using that for public folder replication. I suppose this will have to do, thanks!