Originally Posted by freakinvibe
Deleting multiple messages at once is possible. Touch a message in the list for a second and on the right side, a menu will open. Click on the icon that looks like a tick box. Then touch as many messages you like. They get blue. You can now choose if you want to delete them, mark them opened/unopened, flag them or file them.
I agree this is bad, even more so if you can't scroll and continue to select. Super easy to do in Windows Phone, they should rip that off.