You can run the E2k3 in the Win2K domain. If you follow the set up guide which launches automatically, it will direct you to run SchemaPrep and ForestPrep, which gets your domain ready. If you plan on using RPC-on-HTTP, you must run a Win2K3 domain. Henry -----Original Message----- From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx]On Behalf Of Robinson, Nick Sent: Tuesday, September 28, 2004 8:10 AM To: thin@xxxxxxxxxxxxx Subject: [THIN] exchange 2003 I apologize for this off subject. I'm about to install 2003 exchange server and would like to install it on a 2003 server. Problem is I don't have any 2003 server boxes running. I seem to remember that the first 2003 server upgrade in a domain should be (or has to be) a domain controller? Can anyone tell me if I'm making this up or if there is fact behind that? Thanks Nick PS. Anyone know how to share GALs or create a GAL as an address book between trusted domains? Its not the same forest, organization or anything, only trusted.