[Asphyx]

Here is what you have to do....

First go to email options (the winmo one not manila, from manila you have to select options again as it has it's own option screen)

You need to use the dpad and highlight the account you want to delete. You can not use the stylus as it will just take you to the inbox.
Once it is highlighted press and hold with the stylus and the delete option will show up. Select it and account is gone.