I didn't realize you could do this. If you want a math zone in Office Word, just type Alt+=. This will allow you to enter equations with simple notation. If you type a^2+ b^2=c^2 for Pythagoras algorithm, it will convert give you a nice graphical representation.

While you're in the equation editor, a cool ribbon appears that allows you to edit an equation even if you aren't aware of the linear notation.

If I wanted to write an equation in the past for posting, I would have to hunt down a pregenerated image, use linear notation, or find a third party tool. This is a lot easier.