Office 2024, Windows 11, ...
K07

Checking a Microsoft Office licence: how to recognise a genuine licence

Verifying the authenticity of a Microsoft licence means not guessing, but proceeding systematically. Here are the concrete steps you can use to verify a licence before and after purchase, according to Microsoft's own criteria.

At a glance

Concrete steps to verify the authenticity of a Microsoft Office licence, before and after activation. What Microsoft itself recommends.

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Four concrete verification steps

  • Vendor check before purchase. A genuine company with a public commercial-register entry and a valid VAT ID, a real phone number, a VAT invoice as a PDF, independent reviews on Trusted Shops. Anyone who meets these criteria is usually reputable. Check the retailer below yourself.
  • Format check of the licence key. A genuine Microsoft key has 25 characters in 5 groups of 5 each, separated by hyphens: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX. Other formats are suspicious.
  • Activation test against Microsoft. The real proof is activation on a supported system. If Microsoft's servers accept the licence, Windows reports under Settings → System → Activation "Windows is activated with a digital licence", and Office under File → Account "Product Activated". Microsoft writes "activated" or "licensed", not "genuine". Check activation with Microsoft.
  • Check the licence status (Windows). Via the command line (as administrator): "slmgr /xpr" shows the activation status, "slmgr /dlv" the details including "License Status: Licensed". For Office: "File" → "Account" → licence status.

Key Format Checker

Paste a licence key. The check recognises format and product and warns about public KMS keys. Whether a licence is truly lawful is shown only by activation at Microsoft, not by this check.

Key not working or an activation error? To the activation help with step-by-step solutions and direct technician contact.

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We do not host our own reviews. Independently verifiable on Trusted Shops – verbal rating currently Excellent.

Verify for yourself

You can verify the seller yourself, in two minutes

Who stands behind a shop is publicly verifiable: a reputable dealer has a real company with a registry entry and a valid VAT number, both of which can be inspected. The origin of an individual key cannot be proven from the outside, but it can be verified whether a tangible company stands behind the shop. With us, you can even do it live, right here.

Company
Kewee OÜ
Tallinn, Estonia
Registry code
17352418
EU VAT no.
In the Estonian commercial register

Frequently asked questions

Can I check a licence key without activating it?

Not reliably. Microsoft does not offer a public lookup database. The only real test is activation against Microsoft's server. So: buy from a reputable provider that guarantees a free replacement in the event of an error.

What does a genuine Microsoft licence key look like?

25 alphanumeric characters, in 5 groups of 5, separated by hyphens: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX. The format is identical for Office 2024 / 2021 / 2019 / 2016.

What if activation fails with "Key already in use"?

A common, standard situation, usually resolved via Microsoft's fully automated telephone activation system. Our support guides you through the process free of charge, or provides a replacement key. More on this on our activation-help page.

More guides

About Keywi24

Keywi24 is a Swiss online shop for verified pre-owned Microsoft and antivirus software licences. The team has in-depth market knowledge from over five years of experience. Our goal is not to become the largest licence shop, but the most trusted.

That’s why we don’t invest in marketing hype, but in 90 days of real technical support after every purchase. Legal basis: CJEU ruling C-128/11 (03.07.2012) and Art. 12 para. 2 URG.

Mon–Fri 08:00–18:00 CET+41 800 20 00 07 (free)Live chat response usually <5 min90-day money-back guarantee
Checking a Microsoft Office licence: how to recognise a genuine licence | Keywi24