Within Messenging Options [Storage] Tab.
(Pocket Outlook Inbox, Menu, Tools, Options).

I used to have a SD Card but lost it. Now I realize I cannot open ANY attachments. Like the title states, I cannot uncheck the option to "store attachments on storage card", eventhough it states "Storage Card (Not installed)".

Short of a hard reset, any ideas? I will try to borrow an DS card and see if I can uncheck it tomorrow. Looks like a bug to me.