I have a Lenovo ThinkPad T510 purchased about six years ago. Im perfectly happy with it, except the keyboard needs replacing and batteries seem to lose their ability to charge within a couple of years. The keyboard and battery could be replaced for less than $100. Other than those factors, is there any reason to replace the machine? If I buy a Windows 10 machine, could I or should I continue to run Windows 7 on it? Pablo There is no universal answer to your first question. The time to sell,...

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