MSDE -> SQLExpress 2005 Unattended upgrade

[Flatron]

Hi!

I have to upgrade an MSDE instance to SQL Express 2005 programatically.

When I run SQLEXPR.exe /qb UPGRADE=ALL INSTANCENAME=INSTNAME, the setup exits with exit code 0, so it claims that the process ended successfully, but the instance doesn't get upgraded (installer returns almost immediately after the prerequisite checks).

If I run it without /qb, I find that I have to select the component to be upgraded manually on the screen you find here: http://technet.microsoft.com/en-us/library/cc966393.aspx Under "To perform an in-place upgrade from MSDE to SQL Server 2005 Express" step 7. Is there a command line switch to fix this problem? If not, is there any other way to upgrade an MSDE instance?

Thanks