Right-click folder options
Check it out...when I right mouse click on the folder, I have the option to mark everything as read. I do this often!
I have an issue with the structure of the menu, however. The option to empty the folder is right next to mark all as read. This is dangerous and they deserve to be separated a little. I have accidentally clicked the wrong choice before, and I had to get my entire Inbox out of the deleted folder. Not cool.