Though Wubi is only officially supported on Ubuntu Hardy Heron onwards (8.04), there is a trick exist which enables you to install Ubuntu 7.10 on Windows using a discontinued binary released by Wubi Installer project.
Read more at : Unofficial-Unsupported Tricks: Installing Ubuntu 7.10 Using Wubi though i couldnt find any reason to install 7.10, it is nice to know it could be done.
Wubi is an application which simplifies Ubuntu Linux installation on Windows partition. To Windows users, Wubi eliminates the hassle of having to repartition hard disk which carry the risk of loosing precious data.
Wubi does this by using a loopback device, creating a large file on a Windows partition and installing Ubuntu inside it. The best thing about Wubi is, it does not use virtual machine or any type of emulation. Thanks to Wubi, Ubuntu can be booted natively using Microsoft Windows boot loader.
When you are done experimenting with Ubuntu (who does?), or need to reclaim the hard disk space back, you can choose the uninstall button from the Windows Start Menu and everything will be removed, just as simple as that.
Wubi is one of the few application that made me wish that I have a Windows machine because I’m dying to try it out!
Wubi will be included with the upcoming Ubuntu 8.04 LTS (Hardy Heron) release, due in late April 2008.
Credits to fenris the 1337 pencacai for his original research on Wubi.
Visit Wubi official website here : http://wubi-installer.org/
I’m not a fan of installing and using operating system on VMWare, nevertheless I found out that this guy has made a great tutorial on how to install Windows Vista on Ubuntu using VMWare
Check his website out : Install Windows Vista in Ubuntu, I know some of my friends would be excited by this.