From: Marc on
I would like to add the 'Follow Up Flag' column to my Inbox & Sent Items
folders, so I can remind myself to respond to important emails later.

Searching through the menus I have found that 'Follow Up' is greyed out and
unpickable in the 'Actions' pull down. Similarly 'Show Quick Flag column' is
also grey and unpickable when you pick View>Arrange By>Custom...>Other
Settings>Other Options.

Please could you tell me how to activate this function and/or make these
greyed out options pickable?

Many thanks for your assistance,

Marc