Contoso, LTD. used VPN technologies included with Windows Server 2003 and Windows XP to leverage the connectivity of the Internet to connect remote users, branch offices, and business partners. The Contoso, LTD. Windows Server 2003 VPN and dial-up remote access servers, used in conjunction with an IAS server, provide centralized authentication, authorization, accounting, and administration of remote access policies for a VPN and dial-up remote access solution.