i have mass deleted emails in an account by going to that account's inbox, pressing edit, and then trash all. When I upgraded from 9.3.5 to 10b7 trash is greed out after I select edit. This occurs on my iPad Pro. I don't see it as 10 beta problem because the problem doesn't occur on my iPhone 6s Plus which also is running 10b7. Could it be a setting that got changed? I can't find any setting differences between my iPad and iPhone.