I also know, by my brother's advice that it also runs on old hardware, it can be adapted to old servers. The security can be seen from two different points, some of the systems have the advantage of the code being in the public domain, and developers can fix the problems more rapidly, but it also means hackers can find bad codes...
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Some of the Disadvantages might be the time is going to take to learn. An organization will need to budget some money for training and learning time. I also think the organization will need to think carefully when switching to open-source systems about what programs they currently use, and if the new system will support them...