@Jayms: Well I'd hold off on arranging your inventory for a while. ^^; I haven't tinkered with it yet since my computer access has been limited today and I had to move old posts instead.

To make new folders you have to go into "Edit Folders" in you Mail center and just type in the names of your new folder(s) in the bottom three slots available. Once you save, it'll create those and you can move the PMs into them. (You can make more than 3 folders if you need to, but you can only make 3 at a time.)