If you are using an HP, ensure all email you want to delete is in the inbox, and move everything else to a holding folder. Setup a POP account on your mail client, same ID/PWD, and change advanced settings to uncheck the "leave a copy of messages on server". save settings, and it will download and delete all email in the inbox. THEN, delete the pop account from your computer. Done. Fastest and easiest way to do it.