http://www.microsoft.com/en-us/windows/enterprise/endofsupport.aspx Thus, Windows XP SP3 and Office 2003 will go out of support on April 8, 2014. If your organization has not started the migration to a modern desktop, you are late. Based on historical customer deployment data, the average enterprise deployment can take 18 to 32 months from business case through full deployment. To ensure you remain on supported versions of Windows and Office, you should begin your planning and application testing immediately to ensure you deploy before end of support. Will futures releases of Firefox support XP after April 2014?