22 of 22 people found the following review helpful
Upgrade to Ultimate a snap,
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This review is from: Microsoft Windows 7 Anytime Upgrade (Home Premium to Ultimate) [Online Code] (Software Download)
I upgraded a Dell machine that was pre-installed with Windows 7 Home Premium using the code that Amazon provided electronically, and the upgrade completed without any issues, in a reasonable amount of time. Ultimate features (like encryption, backup to a remote share, etc...) are all available. Registration process with Microsoft also went without a hitch.