Database connectivity cannot be opened because it is version 661. This server support version 655 and earlier
A downgrade path is not supported.
You're trying to attach a SQL Server 2008 R2 database to SQL Server 2008. They are different versions (like SQL 2012 and SQL 2014). You cannot downgrade databases.
You'll have to find a SQL Server 2008 R2 instance to attach this DB to.
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