TITLE: Microsoft SQL Server Management Studio Express
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Restore failed for Server 'SERVER\SQLEXPRESS'. (Microsoft.SqlServer.Express.Smo)

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=9.00.3042.00&EvtSrc=Microsoft.SqlServer.Management.Smo.ExceptionTemplates.FailedOperationExceptionText&EvtID=Restore+Server&LinkId=20476

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ADDITIONAL INFORMATION:

System.Data.SqlClient.SqlError: The backup set holds a backup of a database other than the existing 'DEVELOP' database. (Microsoft.SqlServer.Express.Smo)

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=9.00.3042.00&LinkId=20476

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BUTTONS:

OK
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I had the above message when I tried to restore a backup.
The solution is simple.

In the options pane, just select overwrite the existing database thats it.