General rate: Negative
Spambutcher may have a good algorithm but it's total malware itself. It gives false positives by the score and you can't restore them by the same measure, only one at a freaking time. Let me save you some grief. Don't run it. It will, without warning you first wreck the time stamps of any false positives when you restore them...and you will, because it isn't that good at figuring out what your good mail looks like. The guys that wrote it are several years down the line from when most of the reviews were written, and yet have not fixed the major issues. Maybe a good idea but total crap in execution. Run away.