For now it's not a good idea to switch from old ispconfig 2 to 3, cuz 3 has many bugs. Many things dont work as should, or are questionable. Not to mention crashes of control panel becouse of ajax etc... so it's not a good idea to switch for now. But yeah virtualisation is one of major improovements, since old fashion adding of users is like centuries old... nobody does that in such way anymore.
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