Mozilla Thunderbird
Browsing around the Mozilla site while looking for new themes and extensions for my Firefox browser, I came across the Thunderbird e-mail client. It looks pretty good, but not sure I'll keep it over MS Outlook. The latter is doing a workman-like job of replacing the Palm PIM that I really like (or it's latest update). When I got my latest computer I didn't install it because I stopped using my handheld at about the same time. The calendar isn't very friendly, the address book isn't really up to the Palm standard. The notes feature in Outlook is nice, but I really like the notes feature in the Palm software.
I might need to install the Palm product and use it again then go find a little program called dNoter that I had at one time. It was cool in many ways, like the ability to make the notes variably transparent. It's no longer at download.com, but there are bunches of others there I might try.