Xobni - A New View at Your Outlook Inbox

Bin Ox is one I like, and Book I: Loon Tux is not bad either.
Xobni, however, is but solely an anagram (and not an anagram of Outlook Inbox either); it is Inbox spelled backwards — and a smart add-on that can bring a new order to your Outlook inbox:
›› Xobni puts emails in context: previous conversations with a sender, their key contacts and files exchanged, all put alongside emails as you view them in Outlook or available via fast search. (Windows)