Straight from MS's mouth Regarding the Exchange 2003 and Windows Server 2003 question, I think the following chart might help: Exchange can be installed and run on[1] Supported Active Directory Environments[2] Exchange Version Windows 2000 SP3+ Windows Server 2003 Windows 2000 SP3+ Windows Server 2003 Exchange 5.5 with SP3 Yes No Yes Yes Exchange 2000 with SP2 Yes No Yes Yes Exchange 2000 with SP3 Yes No Yes Yes Exchange 2003 Yes Yes Yes Yes -------------------------------------------------------------- Goran Jovanovic The LAN Shoppe 2345 Yonge St. Suite 302 Toronto, Ontario, M4P 2E5 Bus: 416-440-1167 x-2113 Cell: 416-931-0688 E-mail: gjovanovic@xxxxxxxxxxx --------------------------------------------------------------