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How to tell if a Microsoft Office 2003 product key is legit

I have a client with the installation files of Office 2003 Enterprise on their server. Everyone uses it for Remote desktop (a dozen or so), as well as local installs on their workstations. There's a text file containing a product key.  How can I tell if this is legit? No one can find any original documentation.
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JohnBusiness Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018

Commented:
Run Recoverkeys (recoverkeys.com) on one or two setups and verify what the proper keys are. That is the easiest way.
dbruntonQuid, Me Anxius Sum?  Illegitimi non carborundum.

Commented:
Run the key in a Google search.

If nothing comes back it may well be legit.

If you get lots of hits then ...

Author

Commented:
The key works. What I was wondering was, is there a way to know what they are allowed to do with that product key. For example, they a have a dozen people using it on the server, plus each with their own install on their local desktop. Is there a way to know if the product key they have allows this number of legal installs?
Business Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018
Commented:
The product key will not normally tell you how many installs you can have, especially back with a 10 year old product. Your license agreement tells you how many and Microsoft licensing servers check the total number of usages.
Lionel MMSmall Business IT Consultant

Commented:
If each PC also is using this key then it would have had to be activated and if they activated more than it was allowed for then activation would have failed--then would have required calling MS and if they were using it more than they allowed for they would not have gotten activated. This assumes honestly of course.
Scott McDaniel (EE MVE )Infotrakker Software
Most Valuable Expert 2012
Top Expert 2014

Commented:
If this is truly the Enterprise Edition, then that edition was obtained through a "multiple-license agreement", and no activation was required:

If you had to activate your Office license, you do not own an Enterprise edition of Office. You obtain Enterprise editions of Office through multiple-license agreements. Therefore, Enterprise editions of Office do not require product activation.
From http://support.microsoft.com/en-us/kb/826217

So your client could very well be fully legit. I don't recall exactly how the licensing worked for those, but I believe you purchased a certain "block" of licenses - i.e. 10, 20, 100 etc - and then you were on the honor system to only use that number of licenses.

Author

Commented:
Thanks all. I suppose if they can find the original invoice, it should state on it how many valid installs it covers?
Lionel MMSmall Business IT Consultant

Commented:
Yes that would or if they bought it from a  reseller they may be able to look it up for you.

Author

Commented:
We located the original invoice and license agreement and it gave us the info we needed, thanks.
JohnBusiness Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018

Commented:
@DaveWWW  - Thanks for the update and I was happy to help.