Leopard and MYOB

I'll be installing Leopard on my machine and also my parent's two machines (family pack). For the most part I'm not overly worried about software compatability as there's usually a workaround for me by using something else and my Mum only really uses iLife (which is pretty safe). Only possible problem is my Dad uses MYOB Business Basics on his G5 iMac.

Anyone know if this is working okay in Leopard. If there's a problem I think he'd be better off staying with Tiger but he wants Time Machine up and running...

Any info would be greatly appreciated.