Shoutbox

i think i discover a bug or i dont find a option:

When you have  your conversations of MSN Messenger saved by Messenger Plus for example i log in with my adress and pass,and activate the registry.When my brother goes to the same computer( and log in with him mail) where i am and he activates the registry of conversations too , that the bug comes, in my opinion it shloud save the conversations into diferents folders , the conversations it shloud create a folder with my brothers email adress, and save him conversations there . And when i log in with my adress it should create another folder with my email adress and save my coversations is this other folder. In Messenger Plus options i only have two options (save by data, i think it is per months, that i have activated) an orther is ( save by email , i dont uderstand what it do) but i think as i said if two persons go to the same computer is should create 2 diferents folder with the log in email adress and save into the respective folders, is it possiveble? Or this option is available , i dont see it