I need to activate my legaLLY PURCHASED OFFICE PROFESSIONAL KEY

Use Microsoft’s Product Activation Portal to submit the Installation ID from Office 2010 and obtain a Confirmation ID; this replaced the old automated telephone activation system in December 2025.^1^

Activate the installed copy

1. Open Word 2010.
2. Open File → Help, and select Activate Product Key if that option appears.
3. In the Activation Wizard, choose telephone/offline activation and select your country or region.
   • If it says telephone activation is no longer supported, continue anyway.
   • Record the Installation ID displayed by the wizard.
4. On any Internet-connected device, open the Product Activation Portal.
5. Complete the CAPTCHA and sign in with a personal Microsoft account. This sign-in controls access to the portal; it does not attach your Office licence to that account.
6. Select Activate a Microsoft Product, then select Office and the available Office version/licence type.
7. Enter the Installation ID.
8. If accepted, the portal provides a Confirmation ID. Enter that ID into the Office Activation Wizard and complete activation.

The portal supports retail, OEM, and volume licences and can offer live chat when additional assistance is required and the case qualifies.^1^

Check whether “Professional Plus” is a volume licence

“Office Professional Plus” is commonly a volume-licence edition rather than the ordinary retail “Office Professional” product. Check inside Word:

1. Open File → Help or File → Account, depending on what the installation displays.
2. Look at the complete product name.
3. If it says Microsoft Office Professional Plus 2010, and especially if it shows Change Product Key, treat it as a possible volume-licence installation. Microsoft identifies Professional Plus as a volume-licence product name.^2^

Volume editions use one of these activation types:

• MAK (Multiple Activation Key): activation is performed once against Microsoft. Hardware changes or exhausted activation allowances can require an exception.
• KMS (Key Management Service): Office must periodically contact the organisation’s activation server. This is normally managed by the organisation that supplied Office.^3^

For a MAK licence, use Activate a Microsoft Product in the Product Activation Portal. If this was supplied through an employer, school, or organisation and uses KMS, only that organisation’s administrator can restore activation. A retail Office key cannot activate a volume Professional Plus installation.^4^

If the portal rejects the key or Installation ID

Use the portal’s live-chat option, if offered, and have these ready:

• The original receipt dated 2 March 2011
• The complete 25-character key—provide it only in the private support session
• Any original disc, packaging, order number, or confirmation email
• The full Office edition shown in Word
• The exact activation message or error code
• The dates of the previous assisted installations

Do not publish the product key or receipt details in this public forum. Community participants cannot inspect Microsoft’s licensing records or certify ownership; only Microsoft Support or the organisation that issued a volume licence can assess the key and purchase records.

If the exact error says the product key is not valid, Microsoft states that this means the key has been blocked and will no longer work. In that situation, present the receipt to Microsoft Support and, if requested, contact the original seller.^5^

Important limitation

Office 2010 reached end of support on October 13, 2020. Microsoft no longer provides technical support, security fixes, software updates, or an Office 2010 download. An existing installation may still be used, but it is unsupported and exposed to unpatched security problems.^6^

Keep the existing installation and original media intact while resolving activation; Microsoft no longer supplies the Office 2010 installer if that copy is removed.^7^

References

1. Activate Microsoft perpetual products using the Product Activation portal | Microsoft Support
2. Office repeatedly prompts you to activate on a new PC | Microsoft Support
3. Activate volume editions of Office
4. Office product key errors ERR_MISSING_PARTNUMBER or ERR_INVALID_TOKEN | Microsoft Support
5. Product key is not valid error when activating Office | Microsoft Support
6. End of support for Office 2010
7. Get help with product key errors on Office.com/setup | Microsoft Support