^, I think I read that if you had installed the updates mentioned in post #3, that there is no way to uninstall any updates in Mac Office. You have to reinstall the program, and then reinstall any updates you want to keep (?).
That, coupled with your comment about the XML converters for Mac Office, certainly tells me, that program development for the Mac isn't a big priority for MS.
Thinking of alternatives for non-Intel Mac users...
Trying to port OpenOffice to OS X as I understand it, is not for the weak of heart, so NeoOffice would be an option. But, I seem to remember that you already have a copy of that installed.
For others, they might want to take a look:
http://www.neooffice.org/Edit:
I just noticed that there's another thread running parallel to this one discussing OpenOffice. Glad to see there's a lot of interest in it.