Microsoft withdraws support for Windows XP on April 8
* U.S., UK major banks negotiate fees for extended support
* 95 percent of world's 2.2 million ATMs run on outdated XP
* One-third of ATMs have been upgraded to Windows 7
* Cost of upgrade for each UK bank around $100 million - sources
By Matt Scuffham and David Henry
LONDON/NEW YORK, March 14 (Reuters) - Banks around the world, consumed with meeting more stringent capital regulations, will miss a deadline to upgrade outdated software for automated teller machines (ATMs) and face additional costs to Microsoft to keep them secure.