Microsoft has ended its support towards Windows XP on 8 April 2014. Users saw it coming since Microsoft stopped providing mainstream support way back in 2009. Till recently, it was only providing extended support. Windows XP is probably the most loved OS developed by Microsoft. Normally Microsoft supports its products for 10 years. However, Windows XP could enjoy the benefits for 2 extra years. However, this does not mean that the OS would stop working.
Users can still work on their computer but due to lack of support from the company, the computer would be exposed to viruses and security threats. Moreover, many applications to be developed in the future would not be compatible with the OS. As far as Microsoft Security Essential for Windows XP is concerned, it cannot be downloaded now. If you have it installed in your computer then you would continue receiving virus definitions and Malicious Software Removal Tool (to be downloaded manually) updates until 14 July 2015.
Soon after Microsoft announced that it would stop supporting Windows XP, it urged users to migrate to Windows 7, Windows 8 or Windows 8.1. The company has also offered instructions on its official website to transfer data to the new OS from the old one. Microsoft has also decided to stop offering security updates to another of its popular product, Microsoft Office 2003, along with Windows XP.