Microsoft Office 2021 End of Support: What to Do Now

Quick answer: Microsoft Office 2021 and Office LTSC 2021 reached end of support on October 13, 2026. Word, Excel, PowerPoint, Outlook and other installed apps may still open, and your files do not disappear. Microsoft no longer provides security updates, bug fixes or technical support for these releases. If you still use them, identify your edition, back up important data and choose a supported replacement.

The right replacement depends on what you own today. Home users and small businesses with a retail copy of Office 2021 can consider Office 2024 or Microsoft 365. Organisations using Office LTSC 2021 should evaluate Microsoft 365 Apps or a matching Office LTSC 2024 edition. The sections below explain how to make that choice and move your files safely.

When did Office 2021 support end?

Office 2021 support ended on October 13, 2026. Microsoft says there is no extension or extended security update program for Office 2021. Its Office 2021 support notice explains that the apps may continue to function, but Microsoft no longer supplies software updates, security fixes or phone and chat support.

Office LTSC 2021 reached end of support on the same date. Microsoft warns that continuing to use it may increase an organisation's security exposure and affect compliance requirements. The products have different licensing and deployment models, so check which one you use before choosing an upgrade.

Which Office 2021 products are affected?

Microsoft's Office 2021 lifecycle entry covers Home and Student, Home and Business, Professional, Home and Student for Mac and Home and Business for Mac. The commercial Office LTSC 2021 family has a separate lifecycle entry. Both reached the October 2026 milestone.

To check your installation on Windows, open Word or Excel and select File > Account. Look under Product Information for the product name and edition. On a Mac, open an Office app and select the app name in the menu bar, then About. On a work or school device, your IT team may manage the license and deployment, so confirm the upgrade plan with them before buying a replacement.

What does end of support mean in practice?

It does not revoke your perpetual license or remotely uninstall Office. The change is that newly discovered vulnerabilities and product defects in Office 2021 will not receive fixes from Microsoft. Existing help articles may remain online, but Microsoft says most online help content will be retired and no new support-content updates will be provided.

This matters most when Office handles files and messages from other people. Outlook email, downloaded documents, spreadsheets with macros and files from customers or suppliers all add exposure. Antivirus software and careful file handling remain useful, but they do not replace updates to the affected application.

Compatibility is a separate concern. An unsupported Office installation may keep working with your current hardware and services, yet an operating system, add-in or connected service can change later. Test important workflows before moving to a new Office release; do not wait for an interruption to discover which templates, macros or Outlook add-ins your team depends on.

What should you use instead of Office 2021?

Start with your current license and how you work. A retail Office 2021 purchase, an IT-managed Office LTSC 2021 deployment and a Microsoft 365 subscription are different products. Buying the right year with the wrong edition or deployment method can create unnecessary installation work.

For home users and small businesses: Office 2024 or Microsoft 365

If you prefer a one-time purchase for one compatible PC or Mac, compare the retail Office 2024 editions. Office Home 2024 is designed for home use; Office Home & Business 2024 adds Outlook and commercial-use rights. Check the applications and terms shown on the individual product page before purchasing.

Microsoft 365 is the subscription path. It may fit better if you want ongoing feature updates, cloud services or access across multiple devices, depending on the plan. Office 2024 has a fixed feature set and receives security and quality updates during its support period. Microsoft explains the purchase and update differences.

For organisations using Office LTSC 2021: Microsoft 365 Apps or Office LTSC 2024

Microsoft recommends moving from Office LTSC 2021 to Microsoft 365 Apps where that suits the organisation. For commercial customers that are not ready to move to the cloud, Microsoft identifies Office LTSC 2024 as the supported on-premises upgrade path. This is a decision for your licensing and IT team, especially if Office is centrally deployed or used on restricted devices.

Brytesoft lists Office LTSC 2024 Standard and Office LTSC 2024 Professional Plus. Compare the included apps and the license terms. Standard may cover teams that need core apps such as Word, Excel, PowerPoint and Outlook; Professional Plus may be relevant where Access is required on Windows. For more detail, see Brytesoft's Office LTSC 2021 vs Office LTSC 2024 guide.

How to move from Office 2021 to a supported version

1. Identify every affected installation. Record the Office product name, edition, Windows or macOS version, and whether each device is managed by an employer or school. Include shared computers and devices used only occasionally.
2. Choose the correct replacement. Retail Office 2021 users should compare retail Office 2024 with Microsoft 365. Office LTSC 2021 customers should compare Microsoft 365 Apps with Office LTSC 2024. Check that the new edition contains every application users need.
3. Check system and installation requirements. Confirm operating system support, storage, 32-bit or 64-bit requirements and whether installed Office, Project or Visio products can coexist. Some combinations require a different installation plan.
4. Back up your work. Save important documents, spreadsheets and presentations. If you use Outlook, account settings, local data files, signatures and calendars may also need attention. Include templates, macros, custom dictionaries and locally stored files in your backup.
5. Test the workflows that matter. Open representative files in the new version. Check Excel macros, Word templates, specialist add-ins, mail accounts, printers and document-management connections. Changing between 32-bit and 64-bit Office deserves particular care when add-ins are involved.
6. Install, activate and verify. Follow the instructions for the edition and license you purchased. Remove conflicting installations only after backups and compatibility checks. Open every required app, confirm activation and install available updates.

For centrally managed LTSC deployments, Brytesoft's Office Deployment Tool 2024 guide covers the deployment workflow. A small pilot group can help reveal add-in or template problems before a wider rollout.

Can you keep using Office 2021 for now?

You can continue to use an installed, activated copy, but it is now unsupported. There is no single deadline for replacing every personal computer: the urgency depends on what the device does, which files it handles and whether your organisation requires supported software. A business workstation processing email attachments and customer data generally deserves a faster migration than a rarely used computer holding simple local documents.

If you cannot move immediately, document where Office 2021 remains installed, keep reliable backups and set a date for the upgrade. Treat this as a temporary plan. Microsoft says there is no extended security update option for Office 2021.