The Google Doc I whipped up (see link immediately below) is be no means authoritative, but it does highlight important language specific to Microsoft Licensing eligibility via Tech Soup.
https://docs.google.com/document/d/15zer9dNQ0Vg7l0oRACIwYleXXiEjxH77uatw0C1TCtU/edit?usp=sharing (in theory, no Google+ logging in required to view).
If you're not absolutely certain (eg, you've requested a Tech Soup account and/or access to certain vendors' products and been definitively denied), I recommend consulting directly with Tech Soup and researching your institution's or organization's eligibility for the products you're using and needing.
Also, just a reminder, if you're representing a Public Library using Microsoft Office Desktop products on staff computers, look into the Office 365 for Education licensing options. There's a whole lot of FREE there.
Good luck, have fun, and license responsibly!!!
Joshua Klingbeil - IT Director
Wisconsin Valley Library Service