Come this time next year, support is going to end for Windows XP and a few other pieces of software from Microsoft. The other software joining it is Internet Explorer 6 on Windows XP, Office 2003 and Exchange 2003, these programs will lose their extended support on April 8, 2014.
Exchange Server 2010 Service Pack 2 will end its support on the same day, but with newer Service Packs, it will continue to be supported. The big issue here is that roughly 38% of people on the Internet are still using Windows XP. Not all of these users will jump over to a new OS in the next year, so we should see a large portion of the Internet continue to get slapped with malware.
I think we'll see Microsoft crumble under pressure and extend the support for Windows XP, unless they were to suddenly have surge of old consumers upgrading to new PCs or operating systems, which is doubtful with the way Windows 8 is performing.