
Almost all Macs produced in the last 7 years runs current software - Xserve which is no longer produced is an obvious exception. If you are running something like the 2007 Mac mini (which has support deprecated) then you will have to upgrade to run Mountain Lion or later.


Any Mac on the list below (or later) runs Mountain Lion, Mavericks and (soon) Yosemite.

So why should Skype's developers care about an ancient version of OS X? Oh, I know, because they are Microsoft, and we love to bash them here! Apple does not support their own 2 year old OSes, I have to upgrade my Mac to a more often than not crappier OS just to get things like Xcode running again and sometimes I even have to buy a new Mac because the old one is arbitrarily locked out from a software upgrade.
