You might try saving to MS-Word 97-2003 format (.doc).
I disagree with your comment that this "isn't a Mac vs Windows" issue.
I think you misunderstood my point. I stated that because some comments said that the problem was within OSX. I wanted this thread to stay clear of the Mac v. PC issue. OSX has its own ink system built within the OS; however, very few users see that as an option because they don't own a Wacom or other tablet that brings this as an option.
Secondly, the solution proves that this is a Microsoft issue alone. If you go back to the link I featured in my original post, the impression from MS is that seeing ink in Word 2011 for Mac is impossible. This thread has proven that false.
In MS's defense, inking is still impossible if the user is trying to ink in Word 2011 for Mac. I think that may have caused some of the confusion. However, both my thread and the thread featured in the link I posted never asked if we could originate the ink in Word for Mac, but rather was it possible to see the ink from a SP3 in Word for Mac.