Word (Windows) cannot accept/reject edits from Word (Mac)

[Michael Graubart]

I am co-editing some Word documents created by a colleague, communicating by email. She uses Word for Windows, I use Word for Mac. We both have Reviewing turned on. If she sends me a document and I make suggested changes and add marginal notes, and send it back to her, she can read my edits and notes, but cannot Accept or Decline any of them.

Can anyone identify a reason for this and suggest a solution, to be applied either at her end or mine? We should be most grateful.