Once I logged into his account, I found 4 copies of office that had been purchased. This employee had a Microsoft account that we could go through the password reset procedure since they had left his email active on Exchange. Through trial and error, I discovered that a 2nd former employee that functioned as the onsite tech was the one who actually made the purchase. Outlook was retrieving email for but that was an Office365 account for Exchange. In any event, I knew this wasn't the MS account that Office was tied to because there was no Microsoft account for that address. I did check File / Account in Word & Outlook, but that only reported This may be because that was the user currently logged on, I don't know. Ok - Success! Here's what happened, in case it helps someone else in this situation: Is there any way to determine what Microsoft account was used for the initial purchase? I don't want to waste a lot of time on this, but I also don't want to force them to re-buy office if I can avoid it. I haven't tried other softwares, like RWEverything, I'll be back onsite later today, so I may try that. Running the 'OSPP.VBS' script does indeed give me the last 5 digits of the product key, but produkey, for example, doesn't detect the installation. I wonder if the office manager had a personal MS account that was used or something. Attempting to reset the password using the office managers email address shows no Microsoft account associated. This computer is being replaced, and I'm unable to determine what Microsoft account was used for the initial purchase, and would subsequently be used for a reinstall. Apparently, this copy of office was purchased by the office manager that is no longer with the company.

They have Exchange online ($4.95/user plan). I have a computer with Office 2013 installed, part of a domain.

Recover office 2013 product key