Joomla 2.5 has been out for just over 2 years now, and has finally reached End of Life (EoL) as of December 31, 2014. Many site owners have recently seen a red notice at the top of their Joomla Administration Control Panel that states "Joomla! 2.5 Support Ended On December 31, 2014! Click Here for More Information".
The first thing you need to know is, don't panic, you have time to make the upgrade to Joomla 3, and your site should be secure if you are using the latest Joomla 2.5.28 release. But it is time to take action and start planning your migration to Joomla 3. Read on to find out what you need to do.