SQL Server 2008 Express Edition will be updated through Automatic Update
Starting in September, we are considering automatically updating SQL Server 2008 including all Express Edition to Service Pack 1 (SP1). See https://blogs.msdn.com/petersad/archive/2009/07/30/sql-server-2008-service-pack-sp-1-on-microsoft-update-as-a-required-automatic-update.aspx for details.
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