The warnings were due to end on 8 April 2014 when all other support for the software is scheduled to stop.
However, the numbers still running the 12-year-old operating system convinced it to provide more help.
About 30% of all desktop computers are still running XP, according to figures from research firm Net Applications.
Microsoft explained its change of policy in a blogpost saying the feed of security information was the only support XP users would receive after 8 April this year.
About 30% of all desktops are thought to be still running Windows XP