Recent update disabled my Office 2016, seems to have introduced office 365 files onto computer

Do not roll back Windows updates; if the recent update was KB5002907, Microsoft’s supported recovery is to reactivate Office 2016 or reinstall it if it was removed.

KB5002907 has caused some Office 2016/2019 installations to become unlicensed or, rarely, to be removed. Removing the update does not necessarily undo the Office repair/update operation it already performed.^1^^2^

1. Identify what remains installed

1. Open Word.
2. Select File > Account.
3. Under Product Information, note:
   • The exact product name, such as Microsoft Office Professional Plus 2016.
   • Whether it says Unlicensed Product.
   • The account shown beside Belongs to, if present.
4. Open Control Panel > Programs > Programs and Features and search for Office.

Then use the matching case below.

2. If Office Professional Plus 2016 is still installed

Recover the full license information before uninstalling anything. The final five characters identify an installed key but cannot be used by themselves to activate Office; Office does not reveal the complete key locally.^3^

If Office was bought through an employer’s Home Use Program, now called Workplace Discount Program:

1. Open the Workplace Discount Program order-history page: https://www.microsoft.com/home-use-program/order-history?ocid=cmm3lqm9ryw
2. Enter the work email address originally used for the purchase.
3. Check that mailbox, including junk mail, for the order and product key.
4. If no message arrives, check whether Office appears in the Services & subscriptions section of the Microsoft account used for the purchase.^4^

Once the complete key is available:

1. Start Word.
2. If Sign in to set up Office appears, select the small I don’t want to sign in or create an account link.
3. Enter the complete Office Professional Plus key without hyphens.^5^

If the license was linked to a Microsoft account instead, sign in to Word with that account. Microsoft documents that Office must be activated using the account used to buy it.^6^

3. If a separate Microsoft 365 installation now appears

Multiple Office installations can cause activation conflicts. In Control Panel > Programs > Programs and Features:

1. Search for Office.
2. If both Microsoft 365 and Office Professional Plus 2016 are listed, remove only the edition you do not own or intend to use.
3. Restart Windows.
4. Open Word and activate Office Professional Plus 2016 with its valid account or full key.

Do not remove Office Professional Plus until its key, account, installation source, or entitlement has been recovered. Microsoft specifically identifies multiple installed copies as a possible activation conflict.^7^

Microsoft 365 desktop applications are installed on the computer; the subscription primarily changes licensing and included services. Seeing Microsoft 365 prompts does not by itself prove that your documents were moved online.

4. If Office 2016 was removed

Reinstall it using the Microsoft account previously associated with the purchase:

1. Sign in to the Microsoft account dashboard.
2. Open Office apps.
3. Find Office 2016 and select Install.
4. Run the downloaded setup.
5. Open Word and complete activation.

Office Professional Plus obtained through Workplace Discount Program or volume licensing can have a different installation route; use the recovered program order or contact the former employer’s benefits/IT team if necessary.^8^

Office 2016 support ended on October 14, 2025. It may continue to run after reactivation, but it no longer receives security fixes or technical support.^9^

References

1. KB5002907: Optional update for out-of-date Microsoft 365 Apps installations
2. Office Professional Plus 2016 Has Become Inactive and Unusable - Microsoft Q&A
3. Using product keys with Microsoft 365 | Microsoft Support
4. Install or reinstall Office or Microsoft 365 through Microsoft Workplace Discount Program | Microsoft Support
5. Where to enter your Office product key | Microsoft Support
6. Activate Office for Windows
7. Unlicensed Product and activation errors in Office | Microsoft Support
8. Download and install or reinstall Office 2021, Office 2019, or Office 2016
9. End of support for Office 2016 and Office 2019 | Microsoft Support