Hello everyone.
I remember seeing posts on here asking if you can access your chat logging folders after forgetting passwords, or after a re-install of msngr+. I know I've had problems accessing encrypted chat logs and folders before and was resigned to losing these logs.
I believe I have found an answer to your/our problems on the Microsoft website :-
http://support.microsoft.com/?kbid=308421
I'm not sure if this has been covered before, but I have just found the above webpage whilst looking for a solution to another problem I was having.