Procedure to reproduce the issue:
* Login an MSN account
* Choose "Options" -> "Enable Logging"
* Send a message to a friend, then logout and quit pidgin.
* Run pidgin again, DO NOT login.
* Choose "Buddies" -> "Vide User Log...",
type the first letter of friends, then the whole name will be shown.
* Choose the friend you just sent messages, then you can see the log.
The issue is, one can get the friend list and chat log without login. Some of our customers think it is a security and/or privacy problem.