On Feb 3, 2009, Skype announced the release of Skype 4.0 after extensive beta testing. But on the community forums, users are complaining that New interface is very BAD. Old was perfect, SKYPE ME MODE no longer available in version 4, Missing features in 4.0 (i.e. public chat and shared groups) and much more.
The old release, 3.8, remains available on the download page because “Accessibility features have not yet been completed in this new release”, and users appear to be defecting en masse and reverting to the previous version.