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Q: 

Why can't I connect to SQL Server Express 2008 with sqlmetal 1.00.30729?

I'm trying to connect to my local Sql Server Express 2008 R2 instance (v 10.50.1600) to generate classes via sqlmetal.exe (1.00.30729) and I get the following error:

Error : Failed to generate a user instance of SQL Server.  Only an integrated connection can generate a user instance.  The connection will be closed.

I can connect via SSMS using either Windows or Sql Server authentication, so I'm reasonably sure my credentials are good.

I can also connect to SQL Server 2008 R2 (i.e. the full edition). How come this doesn't seem to be documented anywhere?

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