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Professional to Enterprise

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We've purchased a number of devices MS Surface for example that come with Windows 8 Pro. or Windows 8.1 Pro.


I'd like to "upgrade" these machines to Windows 8.1 Ent.. There's conflicting information out there about whether it's possible and/or the limitations.


From my own testing I can perform the "upgrade" by running the setup program manually and running through the wizard. Unfortunately it deletes all installed applications, but I can recover from that if that's the only way to go.


If possible I'd like to Run the "upgrade" silently while setting certain configurations. I'm attempting to do this using an unattend.xml file from within the existing Pro Installation, however I keep getting prompted to keep existing settings or start fresh. Is there someway I can overcome these initial dialogs?


Is there someway I can perform the "upgrade" and keep all install applications?



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