Windows XP becomes software Rasputin - Rasputin - from Wikimedia Commons

Windows XP is the Rasputin of software, and it doesn't matter if you poison, stab, pummel it or try to drown it, it's nearly impossible for Microsoft to kill.

While Microsoft has managed to gain some market share with its Windows 7 operating system, it seems that 60 percent of the world's installed base still use Russia's greatest love machine, according to figures compiled by Forrester.

Windows 7 is included in two in every ten and, thanks to Forrester's bizarre bid to plug Apple, one in ten PCs are running iPhone or Mac OS software.

Although the figures oddly allocate iPhone software in the PC section, they do show one fairly significant trend - Windows XP continues to be used in 6 to 10 business computers.

Ben Gray, analyst at Forrester and the study author, said that Windows 7 is "clearly accelerating" its penetration in the enterprise, but that XP is somehow managing to resist.

This is even though, as Microsoft points out, the decade old software will no longer receive any support from April 2014.

According to Forrester, both XP and Vista have lost share in the enterprise over the past year.

Vista has fallen from 11.3 percent in April of 2010 to 6.2 percent in March 2011. The only good thing about Vista was that it made it easier for corporates to upgrade to Windows 7, Gray said.

Forrestor's quest to make Apple appear important in a market where it has little impact continued. Although Vole had 87.6 percent of the PC business, the Forrester analyst claimed this was "suffering from consumerisation", with more users who want to use it at work using the same products at home.  We would have thought that Microsoft had no problem with people who use WIndows at home and Windows at work.

However, Forrestor thinks that users run Apple gear at home and are insisting that they should be able to use it at work too.

Of course they could be equally using Windows 7 gear and not have to worry about it, but Forrester is convinced that home users only run iPads, iPhones, and Macs so IT managers are having to convert their entire business systems to work with Apple.