Good reason to make sure you have good policies in place to document accounts and disable/change those accounts. As a follow up, good auditing to make see who has access reources.

He said next year there could be a ten-fold increase in malware (software programmes designed to infiltrate or damage a computer system without the owner’s consent or knowledge) designed to steal personal information of Internet users. Identity theft related cyber crimes were likely to increase many fold in the coming years and cause huge losses to the economy.

Mr. Datt said the economic recession could force companies to cut down their workforce or downsize the salaries of their employees. Disgruntled employees could steal confidential or proprietary information of their companies and sell it for a profit to competitors. Such ‘insiders’ could plant malicious software or key stroke loggers in the company’s computer networks. They could also expose the vulnerabilities of the company’s computer networks to malicious hackers intent on launching denial of service attacks.

http://www.hindu.com/2008/12/26/stories/2008122655370700.htm