I can also sort all other folders by every attribute, including 'From's so am unsure as to why I The only difference from the other users is the mailbox size. I have searched for hours and the only workaround that I've found is to remove the cached mode. I know this has been posted before, such as here, but I still haven't found a solution. As I said his mailbox size is huge. How can I switch it to have sender name on top of subject heading?