Word 2011 now opens oldest Word document formats.
I've been using Word for the Mac since v1.0, so I have a lot of older documents created in early versions. At some point I discovered that Word (I forget which version) dropped support for the earliest document formats -- you could retrieve the text, but that was it. I complained to Microsoft and was basically told 'tough patooties.'
So it was a very pleasant surprise when I went to open an early document, resigned to the prospect of extracting the text (the file was so old it had even lost its type and creator codes and looked like a Unix file to the Finder; I had to choose 'Open any file' to select it) and Word opened it with all formatting, styles etc. completely intact!
Okay, so maybe this doesn't qualify as a hint, but it is sure nice to know.
[crarko adds: I don't have any ancient Word documents left to try this out with, but a hint with 'tough patooties' in it seems like the perfect way to start the new year.]
Mac OS X Hints