Microsoft Window Server 2003 end of life.
So many organization still using Windows Server 2003. The end of support (EOS) date for Windows Server 2003 is fast approaching. On July 14, 2015, Microsoft will stop releasing critical patches for Windows Server 2003. Running unsupported software presents significant risks and complications for your business that will only increase in severity as time goes on.
Think for Server Operating System Up-gradation.
Complete information: http://www.microsoft.com/en-us/server-cloud/products/windows-server-2003/