Spamassassin on my mail server stopped working today. You don't realize just how much work a spam filter saves you until it stops working. I've probably gotten 50 spam emails since this morning.
I've been using Thunderbird in Linux for a while, and it works surprisingly well nowadays. I remember being dissatisfied with it a year or two back, but whatever I didn't like (I can't even remember) seems to be fixed. One problem with Thunderbird is that as soon as you leave home, you don't have it with you. Webmail is good in that regard. But I know there are also versions of Thunderbird that you can install on a USB flash drive. What I'm not sure is whether it's possible to get such a thing to play nicely when used on multiple operating systems. Or alternatively to sync the thing with my home desktop every time I use it. I'll have to play with it a while. I don't have a Windows machine at home to test it on, sadly.