Interesting accounting magic indeed. It seems like tricks like this make it remarkably easy to game stock price. Are there any controls on this?
A $1000 server with a 4 year life span is expensed at $250 a year.
A $1000 server with a 6 year life span is expensed at $167 a year.
You convert your server lifespan from the former to the latter you get $83, or 33%, savings a year.
If you (intend to) keep your servers for 6 years and do not make this adjustment, then you're doing a false accounting, not the other way around.
Not writing down investments is how Enron committed it's mark-to-market fraud.