Comments feature in Word X for Mac

My apologies if this has already been covered somewhere...

I am editing text in Word for Mac and rely heavily on the comments
feature, but cannot seem to get it to function properly in emailed
documents. The comments do not show up when my client opens the heavily
commented files I sent her. I also tried emailing it to myself and
downloaded/opened the file on the same machine I modified it on, but
still the comments do not appear. The appear just fine in versions I
save to my machine and reopen later, though. If anyone has ANY advice
to offer on this matter, I sure would appreciate it!!

Many thanks.

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