any system the IRS has is going to be horrendously old because they pretty much never get funding to upgrade anything.
Here's a Delivery Order (contract) that the Internal Revenue Service used to buy $12.5 million worth of Dell computers from June 23, 2004 to September 30, 2011:
http://government-contracts.fi...
On September 29, 2009, that contract was used to purchase $150,590 worth of "Desktop Replacement Notebooks".... so, back in 2010, the employees now under investigation could have all been using 1-year old Dell laptops running Windows XP or 7.