It has two tools integrated (they are offered also as separate products if you don't think you need an accounting program):
AnyCount: I personally use it for counting files that won't be needing translation memory - such as .xls, .pdf files etc. It's better than Word's function for counting, for example, because it counts even what is inside textboxes.
CatCount: I use this for everything that passes through my translation memory. I apply the rates for 100%, 99-95%, etc. matches, I enter the .csv file created after running the Analyze function and there it is: my weighted count.