After 10 great years, extended support for all versions of SQL Server 2005 is coming to an end on April 12, 2016 it is the time for Upgrade to SQL Server 2014

Upgrading is not just a maintenance task, but an opportunity to provide new value to your business. Moving to SQL Server 2014 or Azure SQL Database enables you to achieve breakthrough performance:

• SQL Server 2014 has been benchmarked to be 13 times faster than SQL Server 2005, before the additional performance gains available from in-memory OLTP.
• AlwaysOn availability groups provide more reliable High Availability.
• Together with Windows Server 2012 R2 you can scale up across compute, networking and storage.
• New tools in SQL Server Management Studio provide an easy on-ramp to cloud to help you get more from your data platform investment.

Reference

http://blogs.microsoft.com/blog/2015/04/13/are-you-still-running-sql-server-2005-now-is-the-time-to-upgrade-to-a-modern-data-platform/

Six Benefits to Planning for SQL Server 2005 and Windows Server 2003 End of Support Now

http://blogs.technet.com/b/dataplatforminsider/archive/2014/12/16/six-benefits-to-planning-for-sql-server-2005-and-windows-server-2003-end-of-support-now.aspx

http://www.infoworld.com/article/2910315/database/sql-server-2005s-end-of-life-clock-is-ticking-down.html