hmm...started out with a Leading Edge Model D 8086, then home-builts; 286, then 386, then 486/16, then 33, then Pentium 1, Pentium 2, and finally Pentium II dual-core. That's my personal stock; the missus, we've replaced about 3 laptops and 1 desktop.
At work - 21 years as a hardware tech: to virus: none. Obsolescence, fire, a sledge-hammer display, rat s**t,
(IBM wouldn't take that motherboard back; they just shipped a new one...
solid-crystal display (hey, get a laptop cold enough...
, and upgrades of laptops, desktops, and servers.....
thousands...
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anahl nathrak, uth vas bethude, doth yel dyenvey...