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CloseReview for Show InOut by Florian Volk
Rated 4 out of 5 stars
I like this add-on very much because I store all my sent and received e-mails in the same folder to get an overview on complete message threads (including my replies).
Unfortunately, the iconic graphic on the "incoming/outgoing" column increases the height of the whole header bar a few pixels on Windows (XP or Vista w/ classic theme). I have to replace the graphic everytime this add-on is updated.
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