Weeks before expiration date, Windows XP still has 29% OS market share | Ars Technica

Windows XP still has 29% OS market share:

• What are the implications of Microsoft no longer supporting Windows XP?
• Do you use any computers that have Windows XP as their operating system?  
• What are some of the precautions you can take if you are not able to upgrade, and must continue using Windows XP after the April deadline?