I am trying to insert underbraces in a mathematical document in a Word 07 document but I can't do it. Can you please assist. Thanks.
4 Answers
For anyone else wondering on how to actually get text beneath the underbrace, i.e. to label it: You need to type another _
and then press SPACE
again. So the correct answer to this question should be:
 Type "
\underbrace
"  Press
SPACE
 Type "
_
"  Press
SPACE
 Either navigate with the arrow keys or click on the placeholders to finish the input.
Hope this helps somebody.

thanks a lot! I really do not understand why microsoft haven't added this as usual button. Commented Dec 8, 2016 at 16:17

This also works in OneNote 2016. Important: the option to insert text above the underbrace only appears once you've pressed another SPACE after the underbrace symbol appeared. Commented Apr 20, 2018 at 6:57
Instead of typing \underbrace
you can also open Equation tools
tab, click Accent
and select underbrace from dropdown menu. It works even in Word 2007
Use the Equation Editor. In Word 2010, click Insert, then Equation. You'll see all the equation tools.
To enter an underbrace type "\underbrace", space, the character to go over the underbrace, space, then continue.
Word Help has full details  search for "Equation Editor"
 Just type in
\underbrace
;  Type in "space" (this should turn the
\underbrace
into a proper underbrace);  Type in the first character of the expression and "space" again (this should put this character just over the underbrace);
 Press the left arrow key on your keyboard and then continue typing the rest of the expression.