Unable to run SharePoint configuration wizard – Error”Unable to upgrade SharePoint Products and Technologies because an upgrade is already in progress."

This article is about an error generated when running configuration wizard in WSS 3.0 / MOSS 2007. The scenario is like this. The SharePoint environment was running with WSS 2.0 and tried to upgrade to WSS 3.0. The WSS 2.0 was installed with a default instance of SharePoint Database (Express /Embedded edition of SQL) and…

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