Office 2021 End of Support: What to Do Before October 13, 2026

Microsoft Office 2021 will reach end of support on October 13, 2026. After this date, Microsoft will stop providing security updates, bug fixes, and official technical support for the affected products. Office 2021 may continue to work, but using it will become increasingly risky as new security vulnerabilities and compatibility issues emerge.

For home users, the deadline is an opportunity to review whether their current software still meets their needs. For businesses, it is an important date by which migration planning, compatibility testing and deployment should ideally be completed.

This guide explains what the Office 2021 end of support means, which products are affected and how to prepare for an upgrade to Office 2024 or Microsoft 365.

Planning your upgrade early can help prevent last-minute installation and compatibility problems. You can compare Microsoft Office 2024 editions to find a suitable option for personal or business use.

When Does Office 2021 Support End?

Microsoft Office 2021 reaches end of support on October 13, 2026.

After this date, Microsoft will no longer provide:

• Security updates
• Bug and stability fixes
• Performance and reliability improvements
• Fixes for newly discovered vulnerabilities
• Official technical support

The same deadline applies to Office LTSC 2021. Microsoft states that continuing to use Office LTSC 2021 after support ends may increase an organisation’s exposure to security risks and could affect its compliance requirements.

Office 2021 end-of-support summary

Microsoft recommends Microsoft 365 Apps as its main migration path for organisations. For businesses that are not ready to move to the cloud, Microsoft recommends upgrading to the latest supported on-premises commercial version, Office LTSC 2024.

What Does Office 2021 End of Support Mean?

End of support does not mean Microsoft will remotely uninstall Office 2021 or prevent you from opening your documents.

Instead, Office 2021 will become unsupported. The applications may continue functioning, but Microsoft will no longer maintain them or correct newly discovered problems.

No more security updates

Microsoft regularly releases updates to address vulnerabilities in Word, Excel, Outlook and other Office applications.

After October 13, 2026, newly discovered vulnerabilities affecting Office 2021 may remain unpatched. This matters because documents and email attachments can contain links, macros, scripts and embedded content that could be exploited.

The risk is greater for users who regularly:

• Open external email attachments
• Download documents from the internet
• Use Excel macros
• Exchange files with customers or suppliers
• Handle financial, personal or confidential information
• Connect Office applications to online services

Unsupported software may appear to work normally while becoming less secure beneath the surface.

No more bug fixes

Office 2021 may eventually experience problems when used with newer operating systems, hardware, drivers, add-ins, and file formats.

After support ends, Microsoft will not release new fixes specifically for Office 2021. A future Windows update or third-party application change could therefore create an issue that remains unresolved.

No official Microsoft technical support

Microsoft will no longer provide standard technical assistance for Office 2021 after the deadline.

Existing support articles and community discussions may remain available, but Microsoft will not develop new fixes for unsupported Office 2021 products.

No new features

Office 2021 already has a fixed feature set and does not receive the continuous feature additions available through Microsoft 365.

Once support ends, it will also stop receiving security and quality maintenance.

Which Office 2021 Products Are Affected?

The October 13, 2026 deadline applies to both the retail Office 2021 family and Office LTSC 2021.

Affected Office 2021 editions include:

• Office Home & Student 2021
• Office Home & Business 2021
• Office Professional 2021
• Office Home & Student 2021 for Mac
• Office Home & Business 2021 for Mac

Microsoft lists these editions under the Office 2021 lifecycle, with retirement scheduled for October 13, 2026.

Office LTSC 2021 also reaches end of support on the same date. It is a separate commercial product family intended primarily for organisations that require a stable, fixed-feature version of Office.

To check your installed version, open Word, Excel or another Office application and select:

File > Account > Product Information

This area normally displays the product name, edition, activation status and whether the installation is 32-bit or 64-bit.

Will Office 2021 Still Work After October 13, 2026?

Yes. Office 2021 may continue to open and run after October 13, 2026, and a perpetual licence does not automatically expire when support ends.

However, “still working” does not mean “safe to keep using.”

Office 2021 will operate without new security updates, bug fixes, or official support. Compatibility with newer systems, services, and add-ins may also become less reliable over time.

Users could eventually experience:

• Unresolved security vulnerabilities
• Compatibility problems with Windows updates
• Issues with Outlook or third-party integrations
• Problems with specialist add-ins
• Reduced reliability with connected services
• Limited assistance when technical faults occur

There may be no visible change on October 14, 2026. The risk will increase gradually as Office 2021 remains unchanged while the technology surrounding it continues to evolve.

What Are the Risks of Continuing to Use Office 2021?

The level of risk depends on how Office 2021 is used. A personal computer used occasionally for local documents has a different risk profile from a business workstation that processes customer information and email attachments every day.

Nevertheless, unsupported installations share several concerns.

Greater security exposure

Office documents can contain macros, scripts, embedded objects and external links. Outlook also processes content and attachments from outside the organisation.

Security updates help protect users from newly discovered attack methods. Once those updates stop, Office 2021 may become more vulnerable.

Antivirus software remains useful, but it is not a substitute for security fixes to the affected Office application.

Compatibility problems

Future versions of Windows, cloud services and business software will be developed around supported products.

Office 2021 may eventually encounter issues with:

• Document management systems
• Accounting and CRM platforms
• Outlook integrations
• Cloud storage services
• Word and Excel add-ins
• Printers and scanning applications
• Custom templates and macros

Businesses that rely on specialised workflows should test them before upgrading.

Compliance concerns

Some organisations must use supported and properly patched software under internal security policies, customer contracts, cyber-insurance conditions or regulatory frameworks.

Using Office 2021 after support ends does not automatically mean that every organisation will breach a regulation. However, unsupported software may make it harder to demonstrate that reasonable security controls are in place.

Higher support costs

Keeping older software can appear economical because there is no immediate purchase cost.

That calculation can quickly change when employees lose time due to compatibility issues or when IT teams must maintain temporary workarounds. A planned migration is generally more manageable than an emergency upgrade following a failed integration or security incident.

Should You Upgrade Office 2021 Now or Wait?

You may not need to replace Office 2021 immediately, but you should begin planning before the support deadline.

Consider upgrading sooner when:

• Office is used for business-critical work
• Your computer stores sensitive information
• Outlook is used for daily business communication
• Multiple devices must be upgraded
• Your organisation has security or compliance requirements
• You rely on macros, templates or add-ins
• Staff testing or training will be required

You may have more time when:

• Office is used occasionally on one personal computer
• The device is already scheduled for replacement
• You mainly work with simple local documents
• You are still comparing Office 2024 and Microsoft 365
• No specialist integrations are involved

The safest approach is to complete the migration before October 13, 2026, rather than waiting until support has already ended.

Office 2021 vs Office LTSC 2024

Office LTSC 2024 is the closest supported alternative for organisations that want locally installed Office applications without moving to a Microsoft 365 subscription.

Like Office 2021, Office LTSC 2024 has a fixed feature set. It receives security and quality updates during its supported lifecycle but does not receive the continuous cloud-based feature additions associated with Microsoft 365.

Office LTSC 2024 is particularly relevant for controlled or restricted environments where cloud connectivity and frequent feature changes may not be suitable.

For a closer look at their differences, read Office LTSC 2021 vs Office LTSC 2024.

Which Office LTSC 2024 Edition Should You Choose?

The right edition depends on the applications your users need and how Office will be deployed.

Office LTSC 2024 Professional Plus

Office LTSC 2024 Professional Plus is suited to businesses, advanced users, and managed environments that need a comprehensive set of desktop applications.

It may be appropriate when:

• Microsoft Access is required
• Users work with databases
• A broader Office application suite is needed
• The software will be deployed in a managed environment
• A stable non-subscription release is preferred

Review Microsoft Office LTSC 2024 Professional Plus when comparing comprehensive Office options for business use.

Office LTSC 2024 Standard

Office LTSC 2024 Standard may suit organisations whose main requirements are Word, Excel, PowerPoint and Outlook.

Consider it when:

• Core productivity applications cover your needs
• Microsoft Access is not required
• Employees need a consistent business suite
• A fixed-feature Office release is preferred
• Centralised deployment is important

View Microsoft Office LTSC 2024 Standard to assess whether it meets your everyday productivity requirements.

Before purchasing any edition, confirm its included applications, system requirements, activation method and permitted use.

Office LTSC 2024 or Microsoft 365?

Office LTSC 2024 and Microsoft 365 address different priorities.

Choose Office LTSC 2024 when:

• You prefer a fixed-feature Office release
• You need locally installed desktop applications
• Frequent interface changes are undesirable
• Your environment has limited cloud connectivity
• You follow a controlled software deployment cycle

Choose Microsoft 365 when:

• You want continuous feature updates
• You work across multiple devices
• Cloud storage is important
• Your team collaborates on documents in real time
• You want closer integration with Microsoft’s cloud services

Microsoft recommends Microsoft 365 Apps for many organisations, while Office LTSC 2024 is its supported on-premises path for commercial customers that are not ready to move to the cloud.

For a detailed edition comparison, see Office 2024 vs Microsoft 365.

How to Prepare for an Office 2021 to Office 2024 Upgrade

A structured upgrade plan can reduce disruption and installation problems.

1. Identify your current edition

Open an Office application and go to:

File > Account > Product Information

Record the edition, activation status, and whether the installation is 32-bit or 64-bit.

2. List the applications you need

Check which applications are required by each user or department. Pay particular attention to Outlook and Access because they may affect the edition you choose.

3. Check system requirements

Confirm that every computer runs a supported version of Windows and meets the requirements for the chosen Office 2024 edition.

4. Back up important data

Back up relevant files and settings, including:

• Documents and spreadsheets
• Presentations
• Outlook data files
• Email signatures
• Templates
• Macros
• Custom dictionaries
• Locally stored contacts or calendars

5. Test macros and add-ins

Custom Excel macros, Word templates, and third-party add-ins may be essential to daily operations.

Test them before a wider deployment, especially when changing between 32-bit and 64-bit Office.

6. Remove conflicting installations

Some Office editions, architectures, and installation technologies cannot coexist on the same computer.

You may need to uninstall Office 2021 before installing Office LTSC 2024.

7. Install, activate, and test Office 2024

After installation:

1. Confirm that every required application opens.
2. Check the activation status.
3. Open representative files.
4. Reconnect Outlook accounts where necessary.
5. Test macros, templates, printers, and add-ins.
6. Install all available updates.

IT administrators handling managed or repeatable installations can consult the Office Deployment Tool 2024 setup guide.

Can You Upgrade Directly from Office 2021 to Office 2024?

Moving from Office 2021 to Office 2024 is generally a product replacement rather than a free in-app upgrade.

You will normally need to:

1. Choose the appropriate Office 2024 edition.
2. Purchase a valid licence or product key.
3. Back up important files and settings.
4. Check system and application compatibility.
5. Remove conflicting Office installations.
6. Install and activate Office 2024.
7. Restore required data and test your workflow.

An Office 2021 perpetual licence does not include a free upgrade entitlement to Office 2024.

Office 2021 End-of-Support Checklist

Use this checklist before October 13, 2026:

• Confirm the installed Office edition
• Identify every affected computer
• Check whether Office is 32-bit or 64-bit
• List the applications each user needs
• Review system requirements
• Back up documents and Outlook data
• Test macros, templates, and add-ins
• Choose Office LTSC 2024 or Microsoft 365
• Complete the migration before support ends
• Verify activation and install updates

Final Thoughts

The Office 2021 end of support deadline is October 13, 2026.

Office 2021 may continue to work after that date, but it will no longer receive security updates, bug fixes, or official Microsoft support. Over time, this can increase the likelihood of security problems, compatibility issues, and operational disruption.

Home users should review their options before the deadline. Businesses should act earlier by identifying affected devices, testing important workflows, and planning a controlled migration.

Office LTSC 2024 is a practical option for organisations that want a newer supported Office release with a fixed feature set. Microsoft 365 may be more suitable for users who need continuous updates, cloud storage and real-time collaboration.

Upgrading before support ends is considerably easier than waiting until unsupported software becomes a problem.