http://www2.sqlblog.com/blogs/sqlos_team/archive/2013/02/17/when-will-my-sql-server-evaluation-edition-expire.aspxThe SQL Server Evaluation Edition is a great way to get a fully functional and free instance of SQL Server for learning and developing solutions. The edition has a built in expiry of 6 months from the time that you install it. I often install an EvalenCommunityServer 2.1 SP2 (Build: 61129.1)