
Skypocalypse: SkypeKit - RIP; Log in from older versions of Skype - RIP.

Fragment of the original letter:
As previously communicated, all support for SkypeKit ended on July 31, 2014. No further updates to the SkypeKit SDK will be available.
In addition, we've made the decision that from 4 August, 2014 we will be permanently retiring the SkypeKit SDK. As a result, any one accessing your SkypeKit-enabled application will be unable to sign into Skype or access any Skype-enabled functionality via your application.
Also today all old versions of skype have stopped connecting. Absolutely.