title: DB cannot be opened because it is version 655. This server supports version 612
body: <p>I'm trying to do some excercises from exam 70-515. Unfortunately I fail while trying to attach Northwind to a grid-control. It would result in:
  <code>NORTHWND.MDF' cannot be opened because it is version 655. This server supports version 612 and earlier. A downgrade path is not supported.</code></p>
  
  <p>I use Windows 7 Home and MS Visual Web Developer 2010 Express. As fas as I understand this error, SQL Express must be an old version on my system. I downloaded and installed SQL Express 2008r2 from <a href="http://www.microsoft.com/express/Database/" rel="noreferrer">here</a>. No effect. From other sources I figured out that I might need to change the instance name: Tools -> Options -> Database Tools -> Data Connections -> SQL Server Instance Name. There it is written SQLEXPRESS. I don't know what else I should insert there?</p>