I recently upgraded to ISA2004 (actually re-installed since I had an ISA 2000 Enterprise edition). Client PCs were updated with the ISA 2004 firewall client. The client PCs do not have a gateway set and browsing is through proxy. All went well except for one thing: I had a Protocol rule to allow POP3 for a particular user on ISA 2000 and I re-created it in ISA 2004. In this configuration (which was also the ISA2000 setup), using Outlook Express 6, I manage to download mail using POP3, however (from the same machine) using Outlook 2003 I get an error that I cannot connect to the POP3 server. I have to repeat that Outlook 2003 used to download POP3 when it was still ISA2000. Is there anything different in the way Outlook Express downloads POP3 mail from Outlook 2003? Thanks Chris