Mac OS X: Mail - Dragging a Unselected Message Does Not Deselect Another

Mail allows you to drag an unselected (nonhighlighted) email message to a different folder--even if a different message is selected.
Mail allows you to drag an unselected email message to a different folder--even if a different message is selected. Any messages that are already selected do not move when you drag the message to a different folder. This is expected behavior.
Published Date: Feb 18, 2012