I think you definitely want to be on SP3 and have the latest round of updates installed, but this month's updates are the last updates scheduled for XP. Windows might still check for other updates, but... Running Windows XP (even fully patched up with SP3 and latest fixes), you probably will have an increasing risk of Windows and IE being attacked. Windows XP has been getting security patches every month for over a decade. So it seems likely that people will continue to discover vulnerabilities in Windows XP that, over time, will be exploited (i.e., used in attacks). More discussion in this thread: [https://support.mozilla.org/questions/992924 How important is microsoft 8.1 upgrade when using firefox browser?]