For almost as long as I?ve used email at work I?ve always used Outlook. Outlook directs you store your emails in a hierarchical folder structure which I find increasingly frustrating and I?m thinking about changing to using categories instead. My problem with folders is that classic one: as soon as you subdivide stuff it?s not easy to bring common mails backs together in a single view. I?m going to use a poor record collection analogy. Say you file stuff by genre, then by decade, then by solo artist or group then it?s easy to find The Damned (Punk/70?s/Group) but not so easy to find Madonna (Pop/80?s/Solo, Pop/90?s/Solo, Pop/00?s/Solo etc). I do have two concerns about using categories. Firstly I have a lot of folders, over 90, and therefore if I assume that my folder structure is valid then I?ll need the same number of categories. Secondly the process of assigning categories is cumbersome in Outlook, adding stuff to folders is far easier. How do you file stuff so that you can find it easily in future ? Please don?t suggest that I ditch Outlook that isn?t an option as it?s the company?s de-facto email client.