My wife just tried to install Skype on her Mac OSX computer. Of course it didn’t work. Nothing ever works on Macs it seems.
After lots of messing around I found some random suggestion on some forum to try this:
1. Quit Skype
2. Go to the folder “ ~/Library/Application Support/Skype/ “
3. Delete the file “shared.xml”
4. Start Skype
Amazingly, this worked.