Rated 5 out of 5 stars

Thunderbird Duplicate Message "Comparison Criteria Combinations" Chart :

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body
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send time / message id
send time / no of lines
sendtime / size
sendtime / subject / from and to /
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subject / size / message id /
subject / size / no of lines /
subject / size / from and to /
subject / from and to / message id / no of lines
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This review is for a previous version of the add-on (0.3.7).