Thanks MPlochocki72. I'm glad to help and I heartily agree that it should not have been necessary.
Microsoft's silence on this issue has been amazingly poor. It's one thing when you're one of the only voices complaining about a certain aspect of a program but when it's the majority of the posters complaining about an issue, there's no excuse.
As evidenced by how simple my macro is (all it does is compare the document to itself, thereby accidentally switching to the old comment format), the code is still there for the previous comment system.
All Microsoft have to do is add a single checkbox to the Options page (e.g., "Display comments in New Format"). There is no real programming effort needed at all, and yet they stubbornly ignore the long list of calls to do so. How a company as large as Microsoft can act so unprofessionally is beyond me.