so far livezilla is the best i have used. such a great thing thats its free as well! Its better then most paid ones we have used. but you guys are right it does sometimes cause higher server loads. Ive seen it cause almost a 1% server load on my duel core. Maybe they should look into that, but as of right now i have had no problems with it. I would recommend it to anyone.
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Livezilla is a great freeware application, I've used it dozens of times in the past and I loved it. However, Kayako really does shine past it in terms of options and such. We started using it recently and it is really an amazing software. But that is what you get when you pay as much as you do for it...
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Im too skeptical about livezilla not introducing a version for Linux OS's, some say their server software is a type of malware and due to some reason it cannot be designed for linux in the same way as it works for windows they are not releasing a version for linux.
livezilla through wine is also not a solution.