Jake
Here is what I would do
1. Select Tools/Customize Columns from the Pull Down Menus
2. Move/add Categories to the "Show These Fields" list
(right side of screen
)
3. Sort your Contacts by the newly added Categories Column
4. Now Contacts with blank Categories will be either at the top or bottom of your sorted list, depending on whether you are sorting Ascending or Descending.
It not the ideal solution, but it sure works.
Regards
John