Yammy is an app that allows you to decode and view not only yours but other's archived YM conversations.
You don't even need a password! Features:
* Decode and view archived conversations and mobile messages. * Control archiving for all users on your PC. * Batch decode entire directories. * Use Yammy in your language. Yammy is currently available in: English, Basque, Catalan, Dutch, French, Norwegian, Romanian, Spanish, Swedish, Tamil and Turkish.