Has anyone used it?
I came across it today.
Seems interesting program.
iCore Virtual Accounts(formerly iCore Computer 3-in-1) is a Windows OS-level (Container-based) virtualization for sandboxing. 
Quote: Originally Posted by
http://icoresoftware.com/windows-virtualization.html iCore Virtual Accounts Overview
iCore VA is an isolated virtual machine that runs on top of existing hardware and operating system.
iCore software allows you to create multiple Virtual Accounts (virtual machines) that can be easily created or deleted without affecting each others’ state or the state of the core operating system.
You can use iCore Virtual Accounts to keep different parts of your life separate. For example, use iCore:
to try new software safely;
to share your PC without worry;
to browse the internet securely.
Unlike many other virtual machines, iCore Virtual Account works on the OS kernel level. This results in:
No additional OS licenses requirement
Almost zero performance overhead
System hardware is fully utilized (like modern video card, game adapter and alike)
EDIT: ahh, now I see why it's not that popular.

Quote: Originally Posted by
Icore System Requirements
Supported Operating Systems: Microsoft Windows XP (Service Pack 3)
Hardware: CPU x86 with 1 GHz or higher processor clock speed, 512 Mb of RAM
Available hard disk space: 1 Gb (for three default virtual accounts)
Internet access: Higher-speed modem or a network connection