Sources: HP, Mike Lynch via the WSJ [PDF]
quote: They knew what they were doing
quote: No. For the acquisition, HP relied on Autonomy's accounting firm, Deloitte LLP. HP assumed that Deloitte LLP was a big enough, trustworthy enough firm that they did not need to do a big investigation with another firm.
quote: Also the market value of Autonomy was something like $5bln, there is no way investors would sell it for less than $6bln...