I installed and then uninstalled Microsoft Security Essentials on Server 2008 R2 - after installation I noticed that there were 12 updates on a supposedly fully updated system. I did a little further comparison with another Server 2008 R2 server and noticed that after installing MSE I now have an extra option titled "Microsoft Update - Give me updates for Microsoft products and check for new optional Microsoft software when I update window". How can I enable this on regular Server 2008 R2 installation without installing MSE?
On Windows Update, if you go to change settings on the left, you will see a checkbox under the title "Microsoft Update". That's the one you want.