Office CD ROM: Serial Number Changes with Each Install

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Because it is Read Only, the CD-ROM version cannot be serialized. Instead, it generates a random number to display in the licensing screen each time you run the Setup program. This may cause confusion if you install more than once, particularly if you have already sent in your registration with the original number. Ideally, you should make a note of your registration number when you first install Microsoft Office and keep it for tracking purposes.