Looking to put ISA server 2004 (HP package) on network with the following items. 2000 enviroment in mixed mode includes Exchange 5.5, SQL 2k, 2 citrix servers, AD server and a member file server all 2k - and a watchgaurd 700. Can isa just be a member server on the 2k mixed mode setup? Can Exchange 5.5 run in native mode? Any other recommendations? Thanks, Paul