Backward compatibility mode (BCM) (Project Server 2010)
Published: December 2, 2010
Backward compatibility mode (BCM) is a feature in upgraded Microsoft Project Server 2010 environments that allows for connectivity from both Project Professional 2010 and Project Professional 2007 SP2 clients. This feature allows you the convenience of upgrade your Project Professional clients (it does not have to be done the same time as the server upgrade). It is also possible to create a new Project Server 2010 Project Web App site in backward compatibility mode if you create the site with empty Office Project Server 2007 databases.
For more information about BCM, see the following articles: