I am having problems with RPC over HTTP, ISA 2004 Sever, Exchange 2003, and Outlook 2003 running XP Sp2 all with the latest updates. From what I can tell in the ISA server logs Outlook is talking to the RPC server port 443 and 80 show up when I have someone on another connection try to connect, however it falls back to RPC TCP which is denied for reason by ISA Server. I have followed everything from Tom's how-to's, and in short when that didn't I started over using Microsoft's how-to's which have not worked either. I know from reason in the ISA Server forums that people have had these issue with Outlook 2003/Exchange and ISA I am wondering if any here who might have experienced the same problem could shed some light on how they managed to get it working, without using another method such as VPN. :-) Thanks Andrew