Convert from Ubuntu side-by-side to Ubuntu as the main OS with W7 as VirtualBox

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http://www.linuxquestions.org – Dear Linuxians, I have been an Ubuntu user (now 12.10) since November. I did a side-by-side install. I only alocated 20G to Ubuntu while left about 100G for my native Windows7 (Home and Business). I am interested now in removing everything from the disk (after backing up of course) and installing Ubuntu as the sole OS and run W7 via Oracle VirtualBox. What are the caveats? For instance, when I bought the laptop I bought a bunch of propietary software (Photoshop, MS Office, Acrobat) but with no CD's. Should I assimilate the loss? Or is there a way of keeping them? What happens with all the Leno (HowTos)