There is nothing worse in an office environment than running that office with old PC’s. The time and the expense of updates and the repairs that inevitably happen with older PC’s all add up.
Older PC’s become slower and less responsive over time and at some point, they have a shelf life. The longest running Windows OS was Windows XP and every office had XP for many years. Even XP eventually had a shelf life and the older PC’s that were barely running XP couldn’t make the jump to Windows 7.