How can I open a 2011 civil 3d dwg file with Civil 3d 2010?

[asilis]

Hello there,
We have a few computers in the office the latest of which is running AutoCAD Civil 3D 2011. If I save a file in this computer and I try to open it with another, which is running AutoCAD Civil 3D 2010, alot of the fiunctionality on the drawing is disabled..

Is there a way to open the files back and forth between the 2 systems? Or the only option is to downgrade/upgrade one of the Civil 3D installations?

Thank you for your help
Thanassis

[sinc]

Civil 3D is not backward-compatible, so the only feasible way to work is to have everyone on the same version.