+ 0 Votes I find it best to talk in terms that Bean Counters Understand HAL 9000 Moderator September 27, 2013 at 2:46pm PST So to that end I set the Life expediency of anything by it's Tax Write-off values and replace items when they get to the point of costing the company money by no longer being of any value to depreciate. It may result in some hardware going out while it's perfectly functional but once it stops being of any Value and no longer can be used to save the company money at Tax Time it's useless to the business anyway. Works for Government Departments and all Private Sector business so I find that it works for me and my needs. Col + 0 Votes I work in a school and Sue T September 26, 2013 at 9:17am PST my lifespan for desktop computers is 5 years for the location they were bought for and then they move on to be loaners/spares or to areas where they are not used as much and/or critical. I buy from companies that automatically give you a 5 year warranty and they are still the same price or cheaper then other companies with 3 year warranties. For laptops for teachers and administrators the turn around is 3 years with those laptops then moving on to be used elsewhere. Student laptops are 5 year turn around and those are still used for other things after 5 years. I buy laptops with 3 year warranties. I hope this helps.