Well there is a problem with that route. I mean that's a good idea. But you still have to buy the os to run the test. Like windows have their adviser thingee so you know before you upgrade. If you have to spend 30 dollars just to find out if something may or many not workthen that is a waste of 30 dollars.
And if it doesn't work then what, just throw the os away. Or wait 3 years to hope it may get fixed and then find out they have no plans to ever make an update. So 30 dollars wasted. Or wait anyway before buying the os. But all the time you waited it could of worked and you waited for nothing. So it's a hit or miss. But if it's a miss then you just wasted 30 dollars.
You can always check the manufacturers website. But if they don't say and never reply emails then you have no choise but to buy the os to try and hope you didn't just waste 30 dollars.
OK, 30 is not much but when they make 10.7 or whatever is next then it will probably be full $129. And if your snow apps don't work on 10.7 then $ you just wasted $129 dollars. And even if its brand new less than 1 week sinse release there is no guarantee even EBAY will give you all $129 back + shipping + listing fees. So it's wasting money if there is no tool to advise ahead of time.
And on another note I thought I read in some blog some guy said he installed snow leopard in place and it made a new folder saying unsupported apps. But I don't see that and can't find the link anymore either.
Then you have to ask yourself why are you upgrading at all? Just for the sake of it? For bragging rights? For some promised app/feature, which in itself can never be guaranteed. You say that the $129 dollars might be too much, but he's probably lost far more then that through lost profit.
Moving to a whole new OS from pretty much a Day-Zero Launch could never be recommonded to business models that generates their revenue from 100% up time. Snow Leopard is what, 4 weeks old, with one dot release? It harks back to the saying, if it aint broke, don't fix it (contrite, I know, but applicable)
My sympathies do lie with the OP. I, too, worked in a 'Mission Critical' team and environment. We had about twenty five macs all running on Tiger, and I believe to this day, they still are. I understand how much this is hurting (power cut, and then ironically, our backup generator failed too)
Learn from this. Research your options. If you dont need/require it, leave it. If you do need it, backup, then backup again. Don't just 'flick the switch'.
Regards,
Maw