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I think three years is about the norm, but of course it varies widely, especially with smaller businesses. I was visiting a company recently, and I saw an IBM PC AT still being used in their warehouse, which blew my mind. It also can be a false savings to extend the replacement cycle too long. Obviously, as machines wear out and become outdated, they don’t work as well, employees spent more time dealing with issues instead of being productive, IT staff is used for more frequently for repairs, and new software doesn’t always work well with old hardware.