Issue:
Pending upgrade is detected on this farm. Either upgrade has not been run, or has failed after a recent update of the SharePoint software.
Run the SharePoint Products and Technologies Configuration Wizard to finish the pending upgrade. For more information about this rule, see KB article 954775 in the rule article list at http://go.microsoft.com/fwlink/?LinkID=120257.
I re-ran the SharePoint Products and Technologies Configuration Wizard on all the servers in the Farm (2 -WFE - 1 - APP - 1 Index) and still encountered this Failure
Final Solution:
I ran the following command from the command line on the Apps/Admin server:
psconfig -cmd upgrade -inplace b2b -wait
Explanation:
When updating your MOSS 2007 installation to SP2, it asks you to run SharePoint Technology and Products configuration wizard at the end. This wizard runs psconfig command, however it still fails to upgrade the MOSS completely for some reason.
When you run above command, the upgrade is completed. The next time you run the upgrade checker tool, the error should be gone.
Reference:
http://nilaykothari.spaces.live.com/blog/cns!2C4C906977BEA6CB!167.entry
