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Microsoft Open License (OLP) what are Product Keys?

What are Product Keys?

Product Key enables use of a software product you have licensed under a specific Volume Licensing program. The Product Keys listed in the VLSC should be used with only Volume License products and are intended for use by your organization only.

An Online Service Activation (OSA) Key is a type of Product Key. It is a single-use redemption key used to activate subscriptions to Microsoft Online Services.