If you go to the Launchbar on the computer that has the 2007 version and
select OPTIONS>PREFERENCE>SECURITY
at the bottom is a check box Workspace Restrictions.
If you deselect this check box the 2007 will then be able to received the
3.1 workspace. The only issue is you can not create workspaces in the 2007
as none of the 3.1 will be able to work with it. Create and develop all in
the 3.1 space and all is well. Once the space has been created in 3.1 I have
found you can then work with it in the 2007 and do further development.
Regards
Marc Dimmick