The only real problem is people running XP-era machines because most of those machines have motherboards that only support 3gb of RAM.
I have a closet full of those. (Literally.) None are currently operating, but I will actually use them when I do A.I. runs. They all have been upgraded to Win7-32 which runs fine with 3GB.
Of course, they do not connect to the internet ever so security is not an issue.
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