The Vista fonts are hampered by the anti-Microsoft sentiment common among designers. Perhaps there is also a segment of type users who see Colibri and the other C-fonts as made specifically for ClearType -- for the screen -- not for professional print design.
Personally, I think the series is one of the brightest things MS has done in years and they continue to school Apple on commitment to typography, but I haven't seen much of the Vista fonts in offline use.

