I upgraded my machine to Windows 8.1 last thing Friday evening before leaving for work for the weekend. When I came back in Monday morning and tried to use Active Directory Users and Computers I discovered it was nowhere to be found on my machine.
As it turns out the upgrade removes the Remote Server Admin Tools (RSAT) during the installation process.
To resolve this issue you can install the Remote Server Admin Tools for Windows 8.1 from here
Can you improve on any of the tips I’ve discussed here? If you can let me know in the comments.