With Microsoft recently announcing that they will no longer work on a mainstream Windows XP version for the Itanium chips (they will still maintain their server/high-end OS version), Intel has no choice but to release a compatible 64-bit chip to AMD's solution. On February 20, 2005, Intel officially released the 6xx series Pentium 4 processors and a Pentium 4 Extreme Edition 3.73 GHz. These processors will support their EM64T 64-bit extensions as well as a few other features.