Doc, the Storm gives you these options: delete from handset only or delete from both server and handset. I got that every time I went to delete by individual email or highlighting them as a group. Then I found this setting to change how it deletes which is both or one at a time. Then there is the  delete prior,that does not bring up a delete option, but it could be because once I set both as the default, I never get the choice again.