My Brother recently wrote a post in his blog about Context Browsing and it is an interesting concept, but the biggest bane of my life is email sorting at the moment.
I use a combination of Thunderbird for personal email and Outlook for work email (because of Exchange, Journal and OWA proxy). In Thunderbird I love using the Bayes classifier to guess where emails should be placed (one click to put it where it has suggested) and this would be a useful addition to Outlook.
However, beyond this I would like to take advantage of taxonomies and hierarchies because when moving an email it can often be difficult to decide which folder is appropriate. If it is an email from the PR agency about a client of ours, or if it is an event involving a customer I would like to tag them in both categories. Then I would like to be able to drill down through a tree of those hierarchies to find emails. Even if this left all the emails in the in-box I would then be able to search the entire in-box by hierarchical taxonomy.
What do you think?