I'm running version 4.2.3 of this on several computers. Just recently I've noticed there are updated version Kerio is not detecting automatically. The website lists a 4.3.268 version and download.com has a 4.40 version listed. Reviews on the newer versions seem to be not so good. I'm wondering if anyone knows what is going on with it and if it's a good idea to just stick with what I've got for now.