This is an indespensible program. I was a little skeptical at first, since you're only allowed to synchronize 40 files at a time before registering, and the price seemed a little steep. However, using this even just one time to synchronize a collection of nearly 2000 files in several levels of nested folders convinced me that it was well worth the price... It would have taken hours by hand, but this little utility did it in seconds. Slick interface.