Windows 2003/.NET Server
Windows 2003 of course also includes IPv6 support out of the box. But it still isn't switched on by default. Next to the command line option to install IPv6, this version of Windows also includes the option to install the IPv6 protocol through the graphical user interface. This way should even be prefered and under no circumstance should the two ways be mixed, when installing/uninstalling the protocol. That is, don't use the graphical user interface to install IPv6 and then try to uninstall it via "ipv6 uninstall" in the shell or vice versa. Some strange things happen then, at least in a few cases when we tried that out. However the usual way through the graphical user interface works just fine, so there's no need to experiment with the command line just for installing IPv6.

IPv6 is installed by opening the network properties of the current LAN connection (right-click on "My Network Places", go to "properties", right-click on LAN-Connection, again go to "properties"). The tab "General" includes the functionality to install additional network protocols. Just click on "Install" and search for "Microsoft TCP/IP Version 6" in the list of protocols. Select it and click "Ok". IPv6 is now installed and enabled. You don't even need to reboot.

Uninstall by deselecting the "ipv6" protocol in network properties of the current lan connection.

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by ironwalker