The argument that keeps getting glossed over here is that the product that's been rendered useless isn't old... it was released two years ago and only superseded one year ago. When I bought it I didn't expect to be in this situation 18 months later. For me, the issue isn't so much about the amount of money, it's purely the principle. In this situation I'd expect the company to say something "Sorry, but I'm afraid your current version won't work with the latest OSX and it isn't financially viable for us to make changes to it... but here's what we're prepared to do..." and then make some kind of conciliatory offer. What we got was "Your version of Parallels won't work with the latest OSX... you have to upgrade. Bye". It's a poor example of customer service and the company has done nothing to address it since either, presumably on the assumption that a few dissenting voices won't make much difference to their bottom line. Hopefully that isn't the case.