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: Retailers like eBay still list old stock or used copies of the software, sometimes including the original physical product key card.

: Sites like Keysfan often sell legitimate OEM (Original Equipment Manufacturer) keys in bulk at significant discounts.

: Some vendors like HypestKey offer keys sourced from decommissioned enterprise volume licenses. Crucial Things to Know Before You Buy

If you are hunting for a key, keep these "vintage" quirks in mind: Office 2010 Pro Plus: I want to buy a product key in 2017

Microsoft no longer sells product keys for Outlook 2010 directly, as they only support current versions. However, you can still find them through alternative channels: