Windows Server 2003
Windows 2000 was unable to avoid the mounting criticism that all of its predecessors had endured in times past. The native SECURITY was terrible. It was relatively easy to lock down a 2000 Server, but you had to actually have to go in and tighten everything manually, leaving room for human error. Nothing was automatically closed up. If you installed a new service, you would have to tighten it down. There was no end to the irritation, but it sure was easy to use.