Name PM Folder

[olijo]

Hello,
after importing a phpBB 2 forum to vBulletin 4.0.6 we've got a problem with the names of the folder.
So we've got :
Imported Saved Received Messages
Imported Saved Sent Messages
I would like to transfer the PM who are in this folder to :
Received Messages
Sent Messages

Someone could tell me witch table i must use to do this, and possibly the SQL request

Thanks you to all