Comment Clarifications (due to rampant bullshit here) (Score 5, Informative) 347
This happened in 2010.
Those were old computers.
They already had the money to buy replacements budgeted in their 2010/2011 budget.
So they had to decide to pull the effort the reimage everything for a couple of months, or just buy the new ones early. Buying the new ones early did cost a bit more (30k for all of them), but less then a cleaning would have cost.
The servers, who where not sheduled for replacement, were reimaged just fine.