Treasury Inspector General for Tax Administration blasted Internal Revenue Service for missing deadlines to upgrade Windows XP PCs and servers running Windows Server 2003. At the deadline, over half of the IRS’s PCs were still running XP. IRS still could not account for 1,300 PCs — about 1% of its total — and so couldn’t say whether they had been purged of the ancient OS. Watchdog: “We believe that running workstations with outdated operating systems pose significant security risks to the IRS network and data” Earlier this year, IRS admitted hackers infiltrated its network and made off with personal information on more than 300,000 taxpayers.”]