Hi Rich, Thanks for the info. It really does seem to be a confusing mixture of issues. Because I can DoS an external Outlook client by installing an Office SP on it, which will prevent it from accessing an internal Exchange Server via an Exchange RPC publishing rule. Tom Thomas W Shinder www.isaserver.org/shinder ISA Server and Beyond: http://tinyurl.com/1jq1 Configuring ISA Server: http://tinyurl.com/1llp -----Original Message----- From: rbell@xxxxxxxxxx [mailto:rbell@xxxxxxxxxx] Sent: Friday, March 07, 2003 2:57 PM To: [ISAserver.org Discussion List] Subject: [isalist] RE: client behind ISA access to remote Exchange behind another ISA using MAPI http://www.ISAserver.org nope, just WinXP SP1. I have Outlook 2000/2002 running and some are at different SR/SP levels, but the only the thing in common on failures is post SP1 installs. On the ones that I can uninstall SP1 I have to also uninstall TCP/IP and reboot, then install TCP/IP and all is back to normal. If you do not do this you are very screwed. The work around that seems to work is the editing of the Registry for the GC, and then adding the Exchange server to the Host file on the local machine. Outlook then connects to the Exchange server. The draw back appears is that from the time of clicking the Outlook icon to having access to Outlook is about 5 minutes. VERY slow. But after that Outlook behaves like a normal install. I has been two months of research and monitoring this group that got me this far. I thought that I was the only one having this trouble and then different threads started that have over tones of my trouble without being it directly. Thanks to all that have posted. I got more from the list then from Microsoft on this one..., as is usual. Rich -----Original Message----- From: Thomas W Shinder [mailto:tshinder@xxxxxxxxxxxxxxxxxx] Sent: Friday, March 07, 2003 2:53 PM To: [ISAserver.org Discussion List] Subject: [isalist] RE: client behind ISA access to remote Exchange behind another ISA using MAPI http://www.ISAserver.org Hi Richard, I've always felt that WinXP SP1 was ill fated, and I don't install it if I don't have to. But like you say, if you have an integrated SP1 in your XP installs, you've got problems. So, is XP SP1 your only problem? From what I can tell, the Outlook SPs tend to be a problem too. Thanks! Tom Thomas W Shinder www.isaserver.org/shinder ISA Server and Beyond: http://tinyurl.com/1jq1 Configuring ISA Server: http://tinyurl.com/1llp