2010 does not use Autodesk.lic. Instead, setenv.bat sets ADSKFLEX_LICENSE_FILE to point directly to the license server (for example, ADSKFLEX_LICENSE_FILE=@myserver;).
But, if you already have 7.5 set up, Softimage 2010 will end up using the 7.5 Autodesk.lic file. That is because of the ADSKFLEX_LICENSE_FILE registery entry: it still points to the 7.5 Autodesk.lic.
eX-SI 