Short answer: A tool that helps to maximize the utilization of system resources, by containing applications in their own environment.
As an ongoing effort, I wanted to have a more versatile/cross-platform development environment. And with VS Code released for all major platforms, I saw a good opportunity to maybe switch to an IDE that I could use on both Windows and Linux, and still be able to code C#.
In the new Update for Windows 10 (NT 10); scheduled to be released soon, users will be able to install Windows Subsystem for Linux.
When Karmic (Ubuntu 9.10) came out I installed it as my main OS, due to solvable but time eating problems I decided to go back to Windows 7. The biggest problem I had was with Adobe Flash.
For about a decade I have been using Yahoo! as my default mail. I found a script that could strip the email address and point it to Yahoo! Mail.