I have been using Thunderbird for quite a while now. It’s a great e-mail client and the fact that you can use it on multiple platforms made it a winner for me. I carry a USB-drive around with Portable Thunderbird on it. A simple edit of the profiles.ini file is enough to point other Thunderbird installs (for instance on my laptop) to the folders on the USB drive. This is a perfect solution for people who need to multiboot and don’t want to keep track of two sets of mail folders. But… Thunderbird was starting to give me a few headaches.