Several clients of mine who switched to Macs a few years ago reported success doing this, and I was able to on behalf of an elderly client around the same time (three-four years ago). You have to call them and explain the situation, but basically they offered the then-current MS Office (2004) at the PC upgrade price (you didn't have to send back the Windows version, you already paid for that).

If they're no longer doing that, it's a pity -- but the home edition of MS Office isn't expensive at present so perhaps that has something to do with it.