An anonymous reader writes "When Microsoft terminated official support for Windows XP on April 8th, many organizations had taken the six years of warnings to heart and migrated to another operating system. But not the U.S. Internal Revenue Service. Only 52,000 of their 110,000 Windows-powered computers have been upgraded to Windows 7. They'll now be forced to pay Microsoft for Custom Support. How much? Using Microsoft's standard rate of $200 per PC, it'll be $11.6 million for one year. That leaves $18.4 million of their $30 million budget to finish the upgrades themselves, which works out to $317 per computer."