I do not recommend this but I have seen a non-critical server where simplex passwords could be used (internal network/non-critical or non-sensitive data) – Resetting password complexity in Windows Server 2008 (R2).
If you need to disable password complexity in Windows Server 2008 and it is grayed out under the group policies –
- Open the group policy management console and edit the GPO on domain level, if you haven’t created one you can use the one that is listed by default.
- Find password complexity in the policies and change
- Open a command prompt as an administrator
- Type gpupdate /force and hit enter