sqlexpress FAQ: Switching between SQL Server 2008 editions

Switching between SQL Server 2008 editions There is an extra step that you need to take when upgrading from one edition of SQL Server 2008 to another, for example when upgrading from Express to Express with Tools. This extra step is called Edition Upgrade (sometimes SKU Upgrade) and the net result is that you have to run the install wizard twice when upgrading an existing instance to a different edition. Why did we do it? http://blogs.msdn.com/sqlexpress/archive/2008/08/24/faq-switching-between-sql-server-2008-edtions.aspx