Answers
Is buying an OEM key online legal?
Short answer
Yes in most countries — Microsoft sells OEM keys to system builders, and reselling unused, unbound OEM keys is permitted in the EU under the UsedSoft v Oracle ruling (CJEU C-128/11). In the US, OEM keys are legal once detached from the original system as part of a single transfer.
The longer explanation
Microsoft's End User License Agreement allows the original purchaser of a Windows OEM license to transfer it once, in its entirety, to another party. Unused keys that were never activated on a specific motherboard are treated under the EU first-sale doctrine as resellable goods.
Risk indicators when buying: keys priced under €15 for Windows 11 Pro, no email receipt, no invoice, marketplace sellers with no contact address. Legitimate resellers offer a money-back guarantee and a written replacement policy.
Primary sources we cite
People also ask
What's the difference between Office 2024 and Microsoft 365?
Office 2024 is a one-time purchase that locks the apps at their October 2024 version forever. Microsoft 365 is a subscription that includes the same apps plus 1 TB OneDrive, monthly feature updates, Outlook with email hosting (Business plans) and Copilot eligibility — but stops working when you cancel.
How many PCs can I install one Office licence on?
Perpetual Office (2021/2024 Home & Student / Home & Business / Pro) activates on exactly one PC and is transferable to a new PC if you uninstall on the old one. Microsoft 365 Personal allows install on unlimited devices but sign-in on five at a time; Family allows the same for six users.
How do I fix Windows activation error 0x80072F8F?
0x80072F8F is a TLS clock mismatch — Windows can't validate Microsoft's activation server certificate because the system date is wrong. Open Settings → Time & Language → Date & Time, enable 'Set time automatically' and 'Set time zone automatically', then re-run activation.
Can I install Windows 11 without TPM 2.0?
Technically yes via a registry bypass during setup, but Microsoft explicitly does not guarantee security updates on unsupported hardware. Most 2018+ PCs have an fTPM in BIOS that just needs enabling — check before bypassing.
Why trust this answer
Written by licensing analysts who handle Microsoft Open, CSP and EU-resale transactions every day. We never paraphrase Microsoft contracts second-hand — every claim links to the actual EULA section, Microsoft Learn article, or court ruling it comes from. Found a discrepancy? Email research@licensevault.net and we will update the page within 48 hours.
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Before choosing a licence
1. Check the exact edition, Windows or macOS compatibility and number of devices covered. A Windows-only key does not install Office for Mac.
2. Distinguish personal, commercial and server use. Virtual machines, shared devices and remote access can require additional licences.
3. Keep the invoice and licence terms. Check transfer rights and support dates: a perpetual licence does not mean perpetual security updates.
Successful activation alone does not prove permission for every use. The applicable Microsoft licence terms take precedence.