Let’s say someone wants to give you their SQL Server database. Maybe they want you to manage it, troubleshoot it, or learn from it. So they hand you a .MDF file and  .LDF file and tell you that you need SQL server 2008 R2 to open them. So you install SQL Server 2008 R2 Express (which, to your relief, is free). You open SQL Server Management Studio(SSMS), and you try to open the .MDF file. You get the following error:

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