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Jun 21, 2011 04:38 AM|LINK
The message would have been something like:
"The solution or project you are open was created in a previous version of Visual Studio"
It would then have taken you through the Visual Studio conversion wizard. It's possible that the conversion process failed. Or that the previous developer setup a mixed development environment to allow both VS2008 and VS2010 to work on the same project.
Here's a thread that discusses a mixed Visual Studio development environment.
Anyway, I think if you tried the upgrade commandline switch in the previous article I posted, it may resolve the issue. Obviously, you will want to make a backup of the current project before attempting the upgrade commandline switch.