We are running FrameMaker versions 4, 5.1, 5.5, 5.56, 6.0, 7.1, and 8.0
(tryout) on Solaris 10.
But with 7.1 and 8.0, we have issues with font handling. With the support of OpenType fonts, the use of the Adobe Colltype font library causes lots of problems - mainly compatibility problems with FM 6 and earlier. Configuring font attributes (like weights, angles, and variations) by editing the $FMHOME/fminit/fontdir/fontlist no longer works; it seems FM now has adopted to the restricted Windows behaviour - there are only 4 supported styles (plain, bold, italic, and bold-italic); everything beyond these is likely to be treated as a variation (even things like "BoldOblique", as in "Helvetica-BoldOblique").
But that seems to be a design flaw, not due to the operating system.
Helge