They have some options.īuy retail keys (the ones from the Microsoft Store) that are full priceīuy keys from VL service in bulk (usually what they choose) The cheaper keys are typically VL keys (keys bought in bulk) that have been thrown away because they're no longer needed.Ī company wants to upgrade all of its computers to Windows 10 and Office 2019, just so they get the security. Microsoft sells you a certified product, guaranteed to work.