Nonetheless working a PC on Home windows XP? If this is the case, then you definately're not prepared to use Apple's new service iCloud. The system of iCloud says that only Windows Vista and Windows 7 are supported. In addition, Outlook 2007 or 2010 recommended for managing contacts and calendars.Windows XP is currently 37.9% is still the most used operating system on Windows computers, according to figures.
Wikipedia can be read on most computers worldwide run Windows XP (37.9%), followed by Windows 7 (29.7%) and Windows Vista (13.1%). These are figures for May 2011, so quite recently. The high market share of Windows XP is probably caused by China, where many old Windows versions in use. MobileMe Windows XP was still sufficient for 10.3 you have plenty of iTunes to Windows XP with Service Pack 2.
Windows XP is now ten years old. Moreover itself no longer supports Microsoft Windows XP in the services it offers: for Explorer 9, you also need Windows Vista or 7.