WARNING: There is no way to undo this action. Changing this setting will enable users to use all of the new features in Project ...

WARNING: There is no way to undo this action.
Changing this setting will enable users to use all of the new features in Project Professional 2010 but it will prevent anyone using Microsoft Project Professional 2007 from connecting to the server. If any project managers are using Microsoft Project Professional 2007 to connect to the server, click Cancel.

Changing this setting will also change the behavior of some PSI methods. If you have applications, add-ins, or other code running against the server, click Cancel. Review the Help content and adjust your add-ins before changing this setting."