Windows 7: WLM 2011 convo history help!

Hello, since i got a temporary laptop while saving up to buy another one, i've been saving all my messenger conversations into a folder (and the option to do so is enabled in messenger)

one night, i decided to back these up on to my external hard drive and after i had done so, the messages stopped saving to the original folder! all i had done was a simple drag and drop to a folder on the external HDD

i only noticed this when i was trying to read recent conversation history and noticed that it wasnt saving after a specific date&time and that specific date&time was the date&time i backed it up on the HDD.

here's where it gets mysterious!
in WLM software, somehow it continues to save all the conversations except the logs all start after the date of when i backed it up. (meaning it was reset into a new file i assume) When i open up a conversation with someone i had chatted with AFTER the back up date and click "Show history", the WLM xml viewer shows the most recent history.



now im wondering where is this "content" located? does anyone know where msn is getting this recent history from? it certainly cant be the folder i set wlm to save the convos to, because they stopped being updated since i backed it up.

PS. in my wlm setttings, it's still set to save conversation history @ the same folder
Thanks