ArcGIS 10, 9.3.1 Map Compatibility

Discussion created by jonharis on Jun 10, 2010
Latest reply on Feb 10, 2013 by Brunnick
I'm running the 10 pre-release on one computer in my office and 9.3.1 on another. I can not currently open maps that are created or edited in 10 on the 9.3.1 Is there a compatibility mode or a planned plugin or update for this or will I need to have all machines running version 10?