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Microsoft Office Activation keys are used to determine if your copy of MS Office product is genuine and not just downloaded from any free website. Most of the time, when we reformat our PCs, we need to install all programs all over again. And in some cases, our keys are lost or misplaced. With OPA-Backup, you can easily save those keys. OPA-Backup is very handy when it comes to backing up and restoring MS Office activation ... more info