X1 Search 8 allows you to see the total number of items in your index, and how many items are available to search by content source.
In the lower left of the X1 UI, you will see the total number of items in your index.
A little to the right, you will see two numbers, displayed in the following format:
The first number, 1, refers to the selected result in the Results List (and displaying in the Preview Pane), the second number, 52 states the total number of items in that Source.
For instance, in the Outlook Source, 24 of 92,880 means you selected the 24th email on your Results List out of 92,880 emails.