End of Service for Microsoft Office 2021 - What's important now

Microsoft Office 2021 is one of the classic purchase versions of the Office suite. Unlike Microsoft 365, this version only receives updates for a fixed period of time. This support ends on 13 October 2026. After this date, Microsoft will no longer provide security updates, bug fixes or technical support.

For companies and organisations, this means that anyone who continues to use Office 2021 after this date will be working with software that is no longer supported.

What does the end of support mean in concrete terms?

Official maintenance by Microsoft ends with the End of Service. This affects all applications in the suite, including

• Word

• Excel

• PowerPoint

• Outlook

• OneNote

The programmes will continue to work on the existing system, but without further updates or support from the manufacturer.

In concrete terms, this means

• No more security updates for newly discovered vulnerabilities

• No bug fixes in the event of problems or software errors

• No technical support by Microsoft

• No adaptations to new operating systems or services

What risks arise afterwards?

The continued operation of software that is no longer supported entails several risks.

Security gaps
New vulnerabilities are no longer closed. This increases the risk of malware or targeted attacks.

Compatibility problems
There may be restrictions or functional problems with future Windows versions or new cloud services.

Lack of manufacturer support
In the event of technical problems, there are no more official updates or support requests.

Compliance and IT guidelines
Many companies and regulated industries require the use of supported software versions.

What alternatives are there?

Organisations should plan in good time how they want to continue working after the end of support.

Microsoft 365

The most commonly used solution is to switch to Microsoft 365. This is a subscription model with constantly updated Office applications.

Advantages:

• Always up-to-date functions

• Ongoing security updates

• Collaboration in real time

• Integration with OneDrive, SharePoint and Microsoft Teams

New Office purchase version

Alternatively, a newer purchase version such as Office 2024 can be used. This offers a longer support period, but also without continuous function updates.

When should you start planning?

A migration should not be started just before the end of support. In many companies, several points need to be checked before a migration:

• Existing macros and add-ins

• Compatibility with specialised applications

• Licence strategy

• Rollout and training of employees

Depending on the size of the company, a complete changeover can take several months.

With the End of Service of Microsoft Office 2021 on 13 October 2026 official support for this version ends. After that, there will be no more security updates or bug fixes.

Companies should therefore check at an early stage whether a switch to Microsoft 365 or a newer version of Officemakes sense. Timely planning ensures that the security, stability and compatibility of the working environment are guaranteed in the long term.