Hi Laurie B,

these can be little tricky to set up now in 2000 & 2010. Follow these steps and it should work.

1. Select the column that you want to apply the conditional format to.
2. Select Conditional Formatting from the Home Tab
3. Select 'New Rule'
4. Select 'Use a formula to determin which cells to format'
5. add the following formula: =A1<>AA1 (assuming these are the cells that you are comparing). Remove any $ signs using F4 several times if required.
6. Click OK

This should now work for all the cells in that column.