Installing Office 2013 -- all of Office 2010 not removed in an "upgrade"?

So, we obtained our VL Office 2013 installation .iso file.

My Windows 8 image currently has Office 2010 installed.

If I run the Office 2013 "setup.exe", it prompts for an "Upgrade" installation (and the "Customize" options indicate it's supposed to remove all other versions).

Yet, after installing the Office 2013 upgrade, I am still left with "Office 14" folders in the Microsoft Office folders C:Program Files and C:Program Files (x86) -- and "Programs and Features" says I still have Office Professional Plus 2010 still installed.

Is this unique to upgrading Office in Windows 8? Or are Office 2010 bits still left behind after an Office 2013 "Upgrade" installation?

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