There was some confusion on which Skype version is supported on which OS X version.
Those of you that have been using older versions of Skype for Mac until now have recently seen a prompt to upgrade Skype when trying to sign in. In a note on the Skype forums, the development team said,
Skype promises happy faces for OS X Leopard users with compatibility update Currently, Mac owners running Leopard can't login to their Skype account thanks to compatibility changes that were made earlier this week. Following the ruffled feathers and wailing and gnashing of teeth over the news that Skype support for versions of OS X below 10.6 are no longer supported, Microsoft's Skype team has said a new update is coming that'll let Leopard users continue to participate in their online text, voice and video chats.
