Hi for everyone. Sorry for my English. I try configure outlook anywhere and autodiscover for remote non domain users on test environment. I use Exc2007 on W2k8R2 and outlook 2010 on windows XP. Exc2007 is behind firewall. Firewall is W2k3 machine with RRAS and I forward 80, 443 port to exc2007 (is DC to). I read white paper on this link http://technet.microsoft.com/en-us/library/bb332063(v=exchg.80).aspx#HowtoConfigureExchangeServices and configure exc2007 autodiscover with "Single certificate that supports multiple DNS names" this certificate from my internal CA. XP on same network with public IP address of the firewall. I modify HOST file of XP for mydomain.info and autodiscover.mydomain.info . When I try configure outlook first time outlook discover my exchange server but authentication not allow me connect to it. Outlook says the username and password is incorrect. But when I configure outlook with advanced properties and type for RPC proxy mydomain.info and for authentication chose "basic" then everything work but internal user credential like user@contoso.local.