I have been unable to get Exchange 2007 Outlook Anywhere working with ISA 2006 (see my other posting). I noticed that the ISA server kicks out this error: "ISA Server tried to delegate credentials, but the Web site does not accept the credentials provided by the authentication delegation scheme configured in the Web publishing rule . Verify that the credentials delegation scheme configured in the Web publishing rule matches an authentication protocol enabled on the published Web site." Also, when I try to do the RPC virtual directory verifcation per http://technet.microsoft.com/en-us/library/bb124175(EXCHG.65).aspx (all examples are in reference to Exchange 2003...we use Exchange 2007). from outside the network, I get "Error code 500 internal server error. The request was rejected by the HTTP filter. Contact the server administrator (12217)" Does this give any clues to anyone? Thanks! Arch