Breaking up with dead operating systems is harder to do than Microsoft thought it would be. Microsoft announced on Thursday that it was issuing a critical patch for Internet Explorer that would be compatible with Windows XP versions of the Internet browser. The new patch for XP users comes even though Microsoft swore last month that it would stop issuing patches for any XP software unless users paid the company additional money to help keep support up. As for the patch itself, it fixes a key vulnerability in Internet Explorer that’s been found to affect IE versions 6 through 11. Microsoft says that the vulnerability “may corrupt memory in a way that could allow an attacker to execute arbitrary code in