The compatibility is a major issue, particularly if the computer is a 64-bit system that many people seem to think is good for them (maybe if they ran large simulation programs and such). For a 64-bit system, you can forget AA7 entirely. For MAC I have no clue. For a 32-bit Windows system, you can make parts work, but the print feature will likely fail and you would have to print to file and open in Distiller -- a lot of extra work.
At this point, AA7 still qualifies for the upgrade price to AAX as I recall. That is probably your best solution.