I have an .mxd that is using absolute pathnames. I want to change this property to use relative pathnames but the option is disabled, grayed out, when I go to the .mxd properties. It is actually grayed out every every .mxd I try. How do I enable this option?
At @kenbuja suggestion I checked the option "Make relative paths the default for new map documents" in Arcmap options. Then I was able to get new .mxds to use relative paths but the option was still disabled in the mxd properties. Also I need to try to get this working about 20 existing .mxds.