title: Conditional Formatting (IF not empty)
body: <p>How do I conditionally format a cell so if not blank it is grey?  </p>
  
  <p>I tried to do 'not equal', but it didn't work.</p>
  
  <p>I am using Windows Office 2003 with Windows XP at work. I don't see the same feature as below:</p>
  
  <p><img src="https://i.stack.imgur.com/qL9xBm.jpg" alt="enter image description here"></p>
  
  <p>What I have tried so far:  </p>
  
  <p><img src="https://i.stack.imgur.com/YKInKm.jpg" alt="enter image description here"></p>
  
  <p>Edit: Figured what was wrong. In my production (actual work Excel), they were filled with white color. It wasn't my Excel file, so I was not aware of this before.</p>