QuoteThe move to drop support for SP1 is in line with Microsoft's stated strategy for support. According to its guidelines, Microsoft guarantees to provide "mainstream support" for a full product for five years, but will only guarantee to support a service pack for 12 months after the launch of the next version of that pack. SP1 shipped in September 2002. SP2 was released in September 2004. There's little reason for anyone to still be running SP1; SP2 contained a range of improvements to XP's security. People can check which version they are running by right-clicking on the My Computer desktop icon and then selecting properties.