Hotfix for multiple Skype clients - Skype Garage

We recommend downloading the updated versions of Skype once they are available.

The affected Skype clients are:

  Skype 5.10 for Windows
  Skype 5.8 for Mac
  Skype 4.0 for Linux
  Skype 1.2 for Windows Phone

The hotfix addresses an issue that occurs only when a user's Skype client crashes during a Skype IM session, which may in some cases result in the last IM entered or sent prior to the crash being delivered to a different IM contact after the Skype client is rebooted or logged in as a new user. Although we cannot determine precisely how many users may have been affected by this error, we believe the number is small given the very specific circumstances under which the error occurs.

友人に送ったはずのメッセージが別人に――Skypeに不具合で対処表明 - ITmedia ニュース
ダウンロードした SkypeSetup.exe バージョン で上書きと。