SQL Server Database Engine Backward Compatibility

Other versions are also available for the following:

SQL Server 2008 Books Online (August 2008)

Topics in the backward compatibility section describe changes in behavior between versions of SQL Server.

Topic	Description
Deprecated Database Engine Features in SQL Server 2008	Deprecated Database Engine features in this release.
Discontinued Database Engine Functionality in SQL Server 2008	Discontinued Database Engine features in this release.
Breaking Changes to Database Engine Features in SQL Server 2008	Database Engine feature changes that might require changes to applications.
Behavior Changes to Database Engine Features in SQL Server 2008	Other changes to database features in this release.