I may be missing the option somewhere (or I am just too tired to see) but, for the life of me, I can't figure out how to mark multiple emails as read in Outlook on the iPhone. I saw the "option to select all mail", which appears to give me the trash or move to folder option.
Edited to add: The account is IMAP, if that makes a difference.
Edited to add: The account is IMAP, if that makes a difference.