Recently after updating the antivirus solution at one of my customer sites they started receiving the following error when attempting to access their old Windows 2003 servers: "\Server\Share is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions. Not enough server storage is available to process this command." The solution was to increase the IRPStackSize on the remote server as referenced in this Microsoft Support article.
Windows Server 2003 R2
This blog article will guide you through the steps of setting up Remote Desktop Licensing or Terminal Services Licensing as it’s known in previous versions of Windows Server. You’ve decided to move from Windows 2003 R2 to 2008 R2 domain controllers and you want to run your terminal services licensing on the new domain controllers. You can run the licensing for all your terminal servers operating with Windows 2000 Server and newer Windows Server versions on Windows Server 2008 R2.