Filters are very very helpful. In the full Outlook I use them to allow me to sort my e-mails into folders etc depending on what they are, who they are from, who they are to etc. Windows live mail (AKA Hotmail) also allows me to do this, however there is one very very important feature missing. In the full fat client I can run a new rule on existing e-mails. So if I decide I want to sort my e-mails in a slightly different way this is very easy to completely change the structure of my inbox despite there being goodness knows how many thousands of e-mails. In Live these rules I create only apply to new e-mails! Argh, maybe I wont sort my Live account then…