Which version of SQL can be used with SBS 2008 Premium?

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Lots of questions about this at the moment & so the definitive answer is:

Components of SBS cannot be downgraded independently. If you choose to downgrade one component, you must downgrade the entire suite.

Because Microsoft recognizes that line-of-business applications may experience compatibility issues moving from one version to the next, for approximately one year from the SBS 2008 Release to Manufacturing (RTM) date, we will ship SQL Server 2005 Standard Edition (both 32 and 64-bit platforms) in addition to the SQL Server 2008 Standard Edition for Small Business with SBS 2008 for the customer’s use in order to address these potential issues.

Customers who receive SQL Server 2005 Standard Edition for Small Business with their SBS 2008 Premium can choose to run SQL Server 2005 Standard Edition instead of SQL Server 2008 Standard Edition with their SBS 2008 Server Premium Edition without having to downgrade their SBS 2008 suite.

Once we stop shipping both versions of SQL Server with SBS 2008 Premium, customers are restricted from downgrading just the SQL Server component.

Customers who received SQL Server 2005 Standard Edition with their SBS 2008 Premium can continue to use it after the shipping period ends, but they may not use both SQL Server 2005 Standard Edition and SQL Server 2008 Standard Edition for Small Business simultaneously. If they choose to continue using SQL Server 2005 after the shipping period ends, they can later choose to install SQL Server 2008 Standard Edition for Small Business instead of SQL Server 2005 Standard Edition.

Customers who do not receive both versions of SQL Server (2005 and 2008) Standard Edition with their SBS 2008 Premium Server license (included for approximately one year from the SBS 2008 Release to Manufacturing (RTM) date) do not receive the rights listed above to run SQL Server 2005 Standard Edition with their SBS 2008 Premium Edition. If they choose to run SQL Server 2005 Standard Edition, they will need to downgrade their entire SBS Premium Edition to SBS 2003 R2 Premium in order to do so.

The SBS 2008 downgrade rights page (including CALs) is being updated this week to reflect the information.

Cheers to Eric Ligman for the notes,

Robbie