But it doesn't work in Microsoft Word for Mac. Fortunately, Word for Mac offers a built-in tool for customizing the keyboard that easily lets you add this feature back in. Just follow this simple recipe:
Select the menu Tools->Customize Keyboard…
In Categories, select All Commands
Then for each of the following, click in Press new keyboard shortcut and enter the keyboard shortcut, and select the command from the "Commands" window and press Assign.
Ctrl-a StartOfLine
Ctrl-e EndOfLine
Ctrl-b CharLeft
Ctrl-f CharRight
Ctrl-p LineUp
Ctrl-n LineDown
Ctrl-d EditClear
Cmd-= ViewZoomIn
Cmd-- ViewZoomOut
Cmd-= ViewZoomIn
Cmd-- ViewZoomOut
This is what it looks like after I mapped the first key: