Windows 7 - Question about Indexing

I was having some problems with Outlook. In debugging one of the things I did was to turn off Indexing - not only from the drive Properties panel for each drive but in the Indexing Options panel as well. Once I found what I think was causing the problem (an add-in in Outlook), I decided to turn Indexing back on. I went to the Indexing Options panel and set everything back to where it was, thinking that would automatically "re-click" the Allow Indexing checkbox on the drives' Properties panels. But that didn't happen. What is the relationship between selecting drives and Indexing Options in this panel versus clicking the Allow Indexing box on a drive Properties panel? The I.O. panel shows that I am currently indexing 111,000 files. But how can that be if the Allow Indexing checkbox is not checked off for each drive?