If the internal folks are going to virtualize the Moodle instance and move it
to Windows it must be for an advantage in doing so. What's the advantage?
Why aren't they taking advantage of what a virtual system
(host operating system) is supposed to be able to to ... that of host guest
operating systems of any flavor ... like Ubuntu. Your migration/move would be trivial.
My 2 'sense' (no I spelled it right!)
In answer to question, however, yes doable. All you need off the linux box is the data directory, an sql dump, and most importantly the config.php file of your current site. Would install a fresh Winders version of Moodle that matches current version running - you probably used the .tar.gz when installing on Ubuntu. That make a diff? Well, if you noticed, the download package for .zip is larger than the .tar.gz.
Best of luck! 'spirit of sharing', Ken