for entries to be missing in Add/Remove, frow what I've been reading. It has all to do with how Add/Remove functions, or doesn't, and nothing to do with Kerio itself. I believe you'd have to go hunting around in the registry to discern the difference. I gather this is not an option.
You say you are 100% sure it is not there. I'm presuming you've also looked at the very bottom of the list too. If it's not a glitch with Window's, my guess is it was never there in the first place, or you inadvertently removed it.
I believe someone suggested reinstalling it, and then ''uninstalling''. Have you tried that? (I'd like to read through this thread again to see who said what, but I'm afraid all I'll wind up seeing is..''Page not found''. So forgive me, if I've made a ''duplicate'' suggestion.)
If you're not going to manually uninstall it, or try to re-install then un-install, I don't know how many options you have left. There very well may be many more, but since I'm not an ''all knowing'' computer wiz, you won't find those options coming from me.
Good luck with it..