The current mail UI leaves it for your imagination what the little green star is (or the little orange flag or the small dialog box), because there is no easy way to find out. This should be rectified with a small popup displaying a text describing what it is that those funny icons sort on (and what they mean ;) )
*** This bug has been marked as a duplicate of 62586 ***
Status: UNCONFIRMED → RESOLVED
Last Resolved: 17 years ago
Resolution: --- → DUPLICATE
Status: RESOLVED → VERIFIED
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