Kerneldump.org

If you have joined a domain remotely through VPN in Windows XP you probably know that the trick is to use the local user to create a VPN connection for everyone, dial-up to your company, join the domain, reboot and then use the logon using dial-up networking feature, when you first logon with your domain account (Thereby caching your credentials for future logons).

In Vista there is no Logon using dial-up networking option (Or at least I haven’t found it instead the trick is to create a VPN connection, dial-up to your company, join the domain, reboot and then logon with the local user. Then dial-up to your VPN again and selest padlock icon, Switch User (While keeping you VPN connection open) and now logon to you domain account.