I too have thought about a replacement for Thunderbird if the bottom falls out. I do use multiple email clients throughout the day but at the end of my day when I get home, I use Thunderbird to download the emails (I use POP at home as I don't really need to look at those emails remotely) to store them locally. I do not like having my emails out there on the internet for long periods of time. I use Windows 10 but also dabble with Linux. I like the fact that I can take my Thunderbird folder with my emails and just copy them wholesale to another installation of Thunderbird and with minimal interaction on my part, have my email back the way it was. Outlook's PST's are almost as simple, Export to a PST file, copy it to a thumb drive and voila! A backup that I can then import to another Outlook installation. But they don't have Outlook in Linux (correct me if I'm wrong, I'm sure you guys will). If I used IMAP for all my email clients I could really care less. But having a 'physical' copy of my emails that is backed up offsite is something that drove me to using email clients to begin with, and Thunderbird since I like it's interface and capability of handling multiple email accounts.

Rappelz is one of my favorites. I use to play Rappelz more frequently but changes in the quest lines that shoot people up to level 150 without too much work made playing it a little less challenging. The old pet system has been supplemented with a new pet system that will allow one to tame just about any monster in the game. I am neutral on that change. The biggest issue was when the new owners of Rappelz stopped allowing people to use SandboxIe to run multiple instances of the game. They can run the game on multiple computers, just not in virtual machines on the same computer (what logic is that?)