See the full post for details from Skype's president
We also learned yesterday about the existence of a security breach that made it possible for people to gain access to those stored messages on TOM's servers. We were very concerned to learn about both issues and after we urgently addressed this situation with TOM, they fixed the security breach. In addition, we are currently addressing the wider issue of the uploading and storage of certain messages with TOM.
It's important to remind everybody that the issues highlighted in yesterday's Information Warfare Monitor / ONI Asia report refer only to communications in which one or more parties are using TOM software to conduct instant messaging. It does not affect communications where all parties are using standard Skype software. Skype-to-Skype communications are, and always have been, completely secure and private.