/upgrade

Upgrades the project file to the latest supported format.

/upgrade

If you try to upgrade a CLR project by using vcbuild.exe /upgrade, you will get the following error message:

Cannot upgrade project.  Please use 'devenv.exe myproject.vcproj /upgrade' to successfully upgrade, 
or 'vcbuild.exe /upgrade /overrideRefVer myproject.vcproj' to override.

To complete the upgrade using vcbuild.exe, you can specify the /overrideRefVer option. This option will set the MinFrameworkVersion for all assemblies to .NET Framework 3.5.

You can also upgrade the project by using the /upgrade option of devenv.exe. For more information, see /Upgrade (devenv.exe).

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