MS Technet blog post on Server 2003 SP2 breaking things on ISA 2004



"After installing Windows 2003 Service Pack 2 on SBS 2003 with ISA 2004 installed, you may experience the following problems:
-You can no longer successfully connect inbound using VPN (Clients get "Error 800: Unable to establish connection").

-You cannot reliably connect to the Internet using SecureNat.

-Some Outlook clients will fail to connect to the Exchange server (even with ISA 2004 SP2 and KB930414 installed)."

http://blogs.technet.com/sbs/archive/2007/03/19/vpn-securenat-nat-and-outlook-clients-not-working-after-installing-windows-service-pack-2-in-sbs-2003-premium.aspx

Ray