This is a way to clean your Messageboard without having to format you Wii system. To be clear: you will NOT save any space on your Wii nand. The space reserved for the message board will always be 20mb regardless of it containing any information. This is purely a way to clean you messageboard and a way to fix a "mailbrick". step 1: MAKE SURE YOU HAVE PROPER BRICK PROTECTION BEFORE ATTEMPTING THIS PROCEDURE! preferably bootmii@boot2 with a recent bootmii nand dump at hand. step 2: Create a NAND with modmii nand builder to obtain a clean cdb.vff file(this is the file that contains all wiimessageboard data) standard location: C:/Modmii/copy_to_usb:/nands/pl_eu/ title/00000001/00000002/data/cdb.vff ( 20mb ) (if you are gonna use Wiiexplorer, copy cdb.vff to your sd on a location where you can easily find it later in step 4) step 3 : On your Wii, dump cdb.vff with fstoolboxmini. This file is saved to the FStoolbox folder on the ROOT of your SD card SD :/FStoolbox/ title/00000001/00000002/data/cdb.vff (20mb) You can optionally save this file if you ever want to restore an older messageboard. step 4 : Replace the dumped cdb.vff on your sd card with the one you created from modmii using Wiixplorer or your PC ( you could keep the clean file safe for future reference) step 5 : Flash the fresh cdb.vff to your nand with fstoolboxmini. ( browse to cdb.vff and press + button) title/00000001/00000002/data/cdb.vff Result: a perfectly clean messageboard. Apps and tools: Modmii : http://modmii.zzl.org/ FStoolboxmini : http://usuaris.tinet.cat/mark/2011/8/fs-toolbox-041-mini Wiiexplorer: http://code.google.com/p/wiixplorer/ (optional) PS: Is it legally allowed for fresh cdb.vff to be shared?