My school provides a setup folder of Office 2007 enterprise for student use. It wouldn't install on CrossOver 6 but with no effort whatsoever today it installed on the new CrossOver Pro 7.1.0.
A tip: CrossOver asked me to specify whether the install was from a Folder (my folder was called 'Office 2007') which I immediately thought was correct. It installed the fonts and extra Microsoft system stuff but failed for the actual Office install. The second time around I picked the other option, install from a file (I picked the setup.exe from my Office 2007 folder).
This method installed everything well. The first option installs all the fonts; the second option installs the software.
It's very fast and everything works!
Good luck
Tom Baker