When I tried it, =rand(3) failed to work. Then I realized that it was probably just my configuration. I am a science-fiction writer and the last thing I need is a word processor that second-guesses by text, so the first thing I always do when encountering a new copy of Word is to turn off all of the autocorrect and autoformatting options.

It appears that the =rand(3) thing is a hidden 'feature' of autocorrect. I turned it back on, generated a number of quick brown foxes and then turned it back off.

I do wonder what other =xxx creatures lurk beneath the surface.

One advantage lipsum.com has over Word's =rand(x) is that lipsum.com correctly places one blank space at the end of a sentence; Word places two blank spaces. You may have learned to smack the space bar twice when taking typing on a typewriter 20 years ago...but one space is considered correct in the word processing world.