I've only today, started to use Evolution.
What does Evolution's Flagged column indicate?
The Flagged column is the third one from the left in the Mail window of the default setup. Its icon is a red exclamation-mark in a red circle.
I find lots of references to the fact that it is a sortable column, but nothing to indicate what its function is.
I've noticed that an un-deleted message (from the Trash) shows as Flagged, but the word "flagged" can suggest that something is currently pending?
I've been experimenting, and now have several Flagged messages. I am reluctant to close Evolution, until I know exactly what it means.
PS. The Flagged column is not the same as the Flag Staus column. The Flag Status column's icon is a Flag... The names are confusing, and as I mention in a comment below, I've been through the Help, but have not found a definitive answer.
Here is a screenshot of the column-headers, and their names (in the customize dialog).