There is no Canadian French MUI, just a generic French one. Most of the differences between the 2 (monetary format and the like) depend on the location you've set (under "Regional and Language options", click "Change the country or region"). Keyboard layouts are also independent of any MUI packs. If you have Vista Ultimate, all the MUI packs should be listed as available updates. Thanks a lot. That clears up a lot of confusion. I guess they changed it from how it was from Windows XP.