SQL Server – SQL Attach DB: Could not open new database [New Question]

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SQL Server - SQL Attach DB: Could not open new database

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SQL Server - SQL Attach DB: Could not open new database
Description
A quick question, answered on Heelpbook, about "SQL Server - SQL Attach DB: Could not open new database.", an error quite common while moving or migrating SQL Server databases between servers.
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Heelpbook.net