Who is still running Windows XP and why? If you're not a large customer with a Premier Support contract, don't count on custom security patches after April 2014.

But in Windows XP's case, Microsoft is believed to have slashed the prices substantially shortly after the company revoked support for the OS on April 8, 2014. Just a quick reminder as to what ...

Custom support agreements, or CSAs, provide critical security updates for an operating system that’s been officially retired, as Windows XP was April 8.

Microsoft slashes Windows XP custom support prices just days before axing public patches Reduces after-retirement support costs for large enterprises as much as 95%. By Gregg Keizer.