Notes2 for Outlook is an add-on for MS Outlook that enables you to add personal notes to any mail item. You can add a note by simply clicking a toolbar button, or from the right-click menu of the message, and view any available notes in the same manner. The note can contain attachments and also be associated with a reminder. To indicate that a message contains a note, you can choose assign one of Outlook colored flags, or you can filter the view and display all messages that contain a note. When you reply to a message that contains a note, you can choose to include the content of the note in your reply.

The license of this software is Free Trial Software, the price is $39.95, you can free download and get a free trial.