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I'm running Word for Mac 2011 and the Copy menu is greyed out. Command-C works. This is on OS X 10.11 El Capitan. My mother-in-law has the same problem and she's on 10.9 Mavericks (I think).
Solved it. Go to:
View > Toolbars > Customize Toolbars and Menus...
Click on Menu Bar row and select Reset
Quit Word and relaunch