All of a sudden my Skype account stopped working on my Pre3 (European azerty version). I could not go online through the Messaging application, and any Skype communication was not working anymore. When I tried to sign in through the Accounts application I got "Unknown Error".
I removed the Skype account, rebooted the phone, and re-added it. It is now working again.
I have no idea what caused the problem, and why it suddenly occurred after I had been using Skype for about two weeks without problems already.
Any ideas appreciated how to track down this malfunction in case it happens again.