I had a months free trial of Office 365 Home but then purchased a new tablet and a year's licence for Office 365 Personal.
I have tried installing the Personal but just get a message that the free Home version has expired. It won't let me install the Personal version.
I phoned a helpdesk and they told me I've got to set up a new Microsoft account in order to install 365 Personal.
I have loads of things attached to my existing Microsoft account. Surely don't need a new one????