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our users would like to see the possiblity to attach a file/attachment
(even on incoming mails), to assign a priority to a mail, and to have that
"mail" listed in the ToDo-list.
The word 'priority' found it for me here (I'm not too good at searching bugzilla either). I don't think it covers the 'to-do' list feature but you could add your comments to that bug or create a new one for the additional feature.