Office 2024 vs Office 2021: Should You Upgrade?

Published: October 17, 2026 | Updated: October 17, 2026

Office 2024 vs Office 2021 used to be a question about features. Since October 13, 2026, it is mostly a question about support. Office 2021 still opens your files, but Microsoft no longer ships security fixes for it, while Office 2024 is supported until October 9, 2029.

That does not make Office 2024 a mandatory purchase for everyone. Can you keep using Office 2021 safely for a while? Are the new Excel functions worth it? Is Office LTSC 2024 the same as retail Office 2024? Will your Office 2021 key activate the new version?

This comparison also differs in more than one way. You are comparing two versions, but each version comes in several editions, from Home to Professional Plus, so the right answer depends on both.

This guide compares Office 2024 vs Office 2021 across support, features, editions, requirements, compatibility and upgrade steps, so you can decide whether upgrading solves a real problem for you.

Office 2024 vs Office 2021: Quick Answer

Office 2024 is the stronger choice for almost anyone installing Office today, because it is the only one-time-purchase version of Office that Microsoft still supports. It adds useful Excel functions, better PowerPoint recording tools, a refreshed interface and safer defaults, and it receives security updates until October 9, 2029.

Office 2021 remains a practical short-term choice only if it is already installed, works offline or in a low-risk setting, and you have a plan to replace it. It ended support on October 13, 2026, with no Extended Security Updates, so every new vulnerability found from now on stays unpatched.

One caveat: the Office 2024 vs Office 2021 decision is about versions. Choosing between Home, Home & Business, Standard and Professional Plus is a separate decision about editions, covered later in this guide.

Office 2024 vs Office 2021 at a Glance

Here is the side-by-side summary most readers need before going deeper:

The decision also depends on things the table cannot show: which apps you use daily, whether your workbooks rely on old macros or ActiveX controls, whether you are on Windows or Mac, and how many PCs you need to cover.

What Is Office 2021?

Office 2021 is the one-time-purchase version of Office that Microsoft released in October 2021. It came in retail editions such as Home & Student, Home & Business and Professional, plus the volume-licensed Office LTSC 2021 editions, Professional Plus and Standard.

LTSC stands for Long-Term Servicing Channel. It is the edition designed for organizations that want a fixed feature set rather than the monthly feature changes of Microsoft 365.

Office 2021 brought features that many people now take for granted, such as XLOOKUP and dynamic arrays in Excel. It was a solid release, and for many users it still does the job on a technical level.

The problem is the calendar. Office 2021 and Office LTSC 2021 reached end of support on October 13, 2026, on both Windows and Mac. For the full timeline, read our guide to Office 2021 End of Support: What Happens After October 13, 2026.

What Is Office 2024?

Office 2024 is the current one-time-purchase version of Office. Microsoft released Office LTSC 2024 for organizations in September 2024 and the retail editions on October 1, 2024.

Microsoft sells two retail editions: Office Home 2024, with Word, Excel, PowerPoint and OneNote, and Office Home & Business 2024, which adds Outlook. Both cover one PC or Mac. Organizations can use Office LTSC Professional Plus 2024, which adds Access, or Office LTSC Standard 2024.

Like Office 2021, Office 2024 does not receive new features after launch. You get the features it shipped with, plus security and quality updates until October 9, 2029.

Microsoft also notes that Office LTSC 2024 does not include the cloud-backed features of Microsoft 365 Apps, such as real-time collaboration and AI-driven automation. If those matter more than a one-time purchase, a subscription may suit you better. You can browse the current editions in Bcdkey’s Office 2024 category.

Office 2024 vs Office 2021: Major Differences

The Office 2024 vs Office 2021 differences fall into seven practical areas. Some matter to everyone, while others only matter to spreadsheet power users or IT admins.

1. Support and Security Updates

This is the difference that outweighs all the others. Office 2021 receives no security fixes, bug fixes or Microsoft technical support after October 13, 2026, and Microsoft states there is no extension and no Extended Security Updates.

Office 2024 and Office LTSC 2024 receive updates until October 9, 2029. Microsoft’s official Office 2024 lifecycle page lists the start and retirement dates.

Office documents are a common way for attackers to deliver malicious content, so an unpatched Office suite is a bigger risk than an unpatched calculator app. The risk grows with every month and every attachment from a stranger.

Verdict: Office 2024 wins clearly. Support is the main reason to upgrade, not the new features.

2. Excel Functions and Performance

Office 2021 gave Excel users XLOOKUP, LET and dynamic arrays, which changed how many people build formulas. Office 2024 builds on that foundation instead of replacing it.

Microsoft lists 14 new text and array functions in Excel 2024, including TEXTSPLIT, TEXTBEFORE, TEXTAFTER, VSTACK, HSTACK, TAKE, DROP, CHOOSEROWS and CHOOSECOLS. There is also a new IMAGE function that places pictures from the web inside cells, and dynamic charts that resize automatically when a dynamic array changes size.

Microsoft also states that workbooks perform faster when several are open at once. Results depend on your files and hardware, so treat that as a welcome improvement rather than a promise.

The caveat is sharing. If you use TEXTSPLIT in a workbook and send it to someone on Excel 2021, those formulas typically return a #NAME? error on their side.

Verdict: Office 2024 is better for data-heavy Excel work. If you only build simple budgets, Excel 2021 already covers you.

3. PowerPoint Recording and Presentation Tools

PowerPoint 2024 adds Cameo, which places a live camera feed directly on a slide, and Recording Studio, which records a presentation with voice, ink and video. It also adds closed captions for video and audio and embedding of Microsoft Stream videos stored on SharePoint.

PowerPoint 2021 can still record slide shows and present them, but the tools are less polished. For teachers, trainers and anyone who records walkthroughs, the 2024 tools save real time.

If you only present slides in a meeting room once a quarter, these additions are pleasant but not decisive. Your slides will not look any less professional because they were made in PowerPoint 2021.

Verdict: Office 2024 is the better choice for recorded training and video content. For basic decks, the two are close.

4. Outlook, OneNote and Accessibility

Microsoft says Outlook 2024 for Windows has improved search for email, calendars and contacts, plus more options when creating meetings. On Mac, Outlook 2024 adds scheduled sending and a Focused Inbox.

OneNote 2024 on Windows gains an improved Draw tab, with faster ink rendering and more pen colors and sizes. Across Word, Excel, PowerPoint and Outlook, Microsoft has also improved the accessibility tools that help you find and fix content that is hard to read for people with disabilities.

Office 2024 on Windows also has a new default theme based on Microsoft’s Fluent Design. It is a modest visual refresh; your muscle memory will survive the move.

Verdict: Office 2024 is nicer to use every day, especially for Outlook search and pen input. None of these features alone justifies an upgrade.

5. Apps Included: Publisher, Teams and Access

Office 2024 does not include Microsoft Publisher. Microsoft states this is because Publisher is being retired and will no longer be supported after October 2026.

Office LTSC Professional Plus 2021 included Publisher on Windows. If you still make newsletters or flyers in Publisher, upgrading Office will not bring it along, so plan to move that work to Word, PowerPoint or another design tool.

The Microsoft Teams app is not preinstalled with Office LTSC 2024, although it is available as a separate download. Access remains part of Office LTSC Professional Plus 2024 on Windows, and Access is not available on macOS in either version.

Verdict: Office 2021 wins only if you depend on Publisher, and even then only temporarily, because Publisher itself is leaving support.

6. Editions and Licensing Options

Office 2021 had a wider retail lineup, including a retail Professional edition. Office 2024 is simpler: Home and Home & Business for consumers and small businesses, and LTSC Standard and Professional Plus for organizations.

Both versions are one-time purchases with no monthly fee. A license covers the version you buy, so an Office 2021 license does not turn into Office 2024 later.

The retail Home and Home & Business editions are licensed for one PC or Mac each. Volume LTSC editions are Windows-focused, with a separate Office LTSC Standard for Mac 2024 for volume customers.

Verdict: Office 2024 has fewer, clearer choices. Pick the edition by the apps you need, not by the longest name.

7. Security Defaults and File Compatibility

Microsoft states that ActiveX controls are disabled by default in Office LTSC 2024, although IT administrators can re-enable them where necessary. ActiveX controls are old embedded components sometimes used in forms and macro-driven workbooks.

Word, Excel and PowerPoint 2024 also save OpenDocument files in ODF 1.4 by default. ODF is the open file format used by suites such as LibreOffice, so this mostly matters to organizations that exchange files with them.

Microsoft also notes that the Publish to Power BI feature has been removed from Excel in Office LTSC 2024. Teams that relied on it will need to publish from Power BI Desktop or the Power BI service instead.

Verdict: Office 2024 is safer by default. Test any legacy forms or ActiveX-based workbooks before you roll it out.

Office 2024 vs Office 2021 System Requirements

The hardware requirements are almost identical, which makes the Office 2024 vs Office 2021 decision easier. Microsoft lists the following:

These are minimum specifications, not a promise of ideal performance. For large Excel models and recorded presentations, 8 GB of RAM and an SSD make a visible difference.

Microsoft states that Office LTSC 2024 also supports Windows 10 LTSC 2021, Windows 10 LTSC 2019, Windows Server 2022 and Windows Server 2025. If you are still on standard Windows 10, read our guide to the Windows 10 ESU end date, because your operating system may need attention before Office does.

Can Office 2024 Open Office 2021 Files?

Yes. Office 2024 and Office 2021 both use the same file formats, such as .docx, .xlsx and .pptx, and Microsoft states that Office LTSC 2024 keeps the same major version number, 16.0, as Office LTSC 2021.

Files also travel the other way, with one condition. Documents made in Office 2024 open in Office 2021, but features that did not exist in 2021, such as the new Excel functions, will not work there.

Can You Install Office 2024 Alongside Office 2021?

No, not as a recommended setup. Microsoft advises uninstalling earlier versions of Office before deploying Office LTSC 2024, and running two Click-to-Run suites of the same major version side by side tends to cause conflicts.

Your documents are stored separately from the apps, so removing Office 2021 does not delete them. Back them up anyway, because a backup is cheaper than optimism.

Does an Office 2021 Product Key Activate Office 2024?

No. Office product keys are tied to a specific version and edition, so an Office 2021 key will not activate Office 2024, and an Office 2024 Home key will not activate Professional Plus.

Updates within the same version are different. Monthly Office 2024 security updates install on top of your existing installation and do not need a new key.

Office 2024 and Office 2021 Support Status

Here are the dates that matter, according to Microsoft’s lifecycle pages:

Microsoft’s lifecycle site shows the Office 2024 retirement as 6:59 AM Pacific Time on October 10, 2029, which is simply the end of October 9 in Redmond. Office LTSC 2024 receives five years of mainstream support and, as Microsoft’s Office LTSC 2024 overview explains, no extended support afterward.

In short, Office 2024 gives you about three years of supported use from today, while Office 2021 gives you none.

Version vs Edition: Retail Office 2024 or Office LTSC 2024?

Choosing Office 2024 over Office 2021 settles the version. You still need the right edition, and that depends on the apps you use and whether you work on Windows or Mac.

A student or family PC is usually well served by Microsoft Office 2024 Home, which is a bind key for one PC and links to your Microsoft account, but it does not include Outlook.

A freelancer or small business that needs Outlook, or works on a Mac, should look at Microsoft Office Home & Business 2024, which covers one Mac or Windows PC and includes business-use rights.

Windows users who need Access, or who want the same edition their office already runs, can choose Microsoft Office 2024 Professional Plus LTSC for one PC. It is Windows only, so it is not a replacement for Office 2021 on macOS.

You do not need Professional Plus simply because it has the longest name. If Access is not part of your work, Microsoft Office 2024 Standard gives you Word, Excel, PowerPoint, Outlook and OneNote on one Windows PC.

Who Should Choose Office 2024?

In the Office 2024 vs Office 2021 decision, Office 2024 is the right choice when you:

• Are installing Office on a new or rebuilt PC or Mac
• Open email attachments and downloaded files every day
• Need supported software for compliance, insurance or client contracts
• Work heavily in Excel with text cleanup, stacking or reshaping data
• Record lessons, training videos or narrated presentations
• Prefer a one-time purchase over a Microsoft 365 subscription
• Want a fixed feature set that will not change every month
• Plan to keep the same Office version until 2029

Who Should Choose Office 2021?

Office 2021 is the weaker side of the Office 2024 vs Office 2021 comparison today. Buying it new no longer makes sense for most people, but keeping an existing installation for a short time can be reasonable when you:

• Already own it and it works on a PC that rarely touches the internet
• Use it only for simple documents created by yourself
• Rely on Publisher files you have not yet moved to another format
• Run legacy ActiveX forms that you have not yet tested on Office 2024
• Have a dated replacement plan, such as the next hardware refresh
• Need a little time to budget for licenses across several PCs

Treat this list as a bridge, not a destination. An unsupported Office suite is a bit like a front door with a lock nobody will repair: it still closes, but you would not want to rely on it forever.

Should You Upgrade from Office 2021 to Office 2024?

Yes, for most people, and soon rather than eventually. An upgrade makes the most sense when it solves a real problem, and here the real problem is that Office 2021 no longer receives security fixes.

The answer to the Office 2024 vs Office 2021 upgrade question differs by reader:

• Home users and students: upgrade when convenient, ideally within a few months, and keep Office 2021 off untrusted files until then
• Freelancers and small businesses: upgrade now, because client files and email attachments are exactly where Office vulnerabilities are exploited
• IT admins and organizations: test Office LTSC 2024 with a pilot group, especially macros and ActiveX content, then roll it out in waves

If you are weighing a subscription instead, remember that the Office 2024 vs Office 2021 question is only one option. Microsoft 365 receives new features continuously, while Office 2024 stays fixed. Bcdkey’s Microsoft Office category shows both one-time and other options side by side.

IMPORTANT: If your business runs critical macros, add-ins or database front ends in Office, involve an experienced administrator and test them on Office 2024 before removing Office 2021 from production PCs.

How to Upgrade Safely from Office 2021 to Office 2024

The move from Office 2021 to Office 2024 is usually simple, and ten minutes of preparation can save an afternoon of searching for a lost template. Follow these steps:

1. Check your current version in any Office app under File → Account → About.
2. Back up your documents, Outlook data files (.pst) and custom templates.
3. Note your Outlook account settings and any add-ins you rely on.
4. Choose the Office 2024 edition that matches your apps and platform.
5. Test important macros, ActiveX forms and add-ins on one PC first.
6. Uninstall Office 2021 from Settings → Apps → Installed apps.
7. Restart the PC.
8. Install Office 2024 from an official source or the installer provided with your license.
9. Activate Office 2024 with the key for the matching edition.
10. Open Word or Excel, then run File → Account → Update Options → Update Now.
11. Restore templates and confirm Outlook connects to your mailbox.

For Office LTSC 2024, Bcdkey provides installation files in the Bcdkey Download Center. Avoid pre-activated or unofficial installers, which can carry malware and cannot be updated reliably.

The deployment process for Office LTSC 2024 Professional Plus follows the same pattern as the previous version, so our guide on how to download, install and activate Office 2021 Professional Plus is a useful reference for each screen.

Need to activate by phone? Read our guide on how to activate Microsoft Office by phone, then use the Bcdkey Get Confirmation ID tool to turn your Installation ID into a Confirmation ID, the code that completes phone activation.

Lost the key you bought from Bcdkey? You can find it in My Account. Organizations equipping many PCs can review the Bcdkey B2B wholesale program or the Microsoft Office 2024 Pro Plus LTSC 20PC license, which activates up to 20 Windows PCs with one key.

Final Verdict

Office 2024 vs Office 2021 is not really about Cameo or TEXTSPLIT. It is about whether your Office suite still receives security fixes.

Office 2021 ended support on October 13, 2026, with no extended updates. Office 2024 is supported until October 9, 2029, adds practical improvements in Excel, PowerPoint and Outlook, and keeps the familiar one-time purchase model.

The choice can be summarized simply:

• Choose Office 2024 for any new install, any business use and anyone who opens files from other people.
• Choose to keep Office 2021 only as a short bridge on a low-risk PC, with a dated plan to replace it.

Before you buy, write down the apps you actually open in a typical week. That list, not the edition name, tells you whether Home, Home & Business, Standard or Professional Plus is the right fit.

Ready to replace Office 2021 with a supported suite? Explore Microsoft Office 2024 Professional Plus LTSC.

Prefer Outlook on a Mac or a single PC for your home office? View Microsoft Office Home & Business 2024.

FAQ About Office 2024 vs Office 2021: Should You Upgrade?

Is Office 2024 better than Office 2021?

Yes, for most users. Office 2024 receives security updates until October 9, 2029, and adds new Excel functions, PowerPoint recording tools and improved Outlook search, while Office 2021 no longer receives updates.

Office 2024 vs Office 2021: which is better for a small business?

Office 2024. A small business handles client files and email attachments every day, so it needs a supported suite, and Office Home & Business 2024 or Office LTSC 2024 receive security updates until October 9, 2029.

Is Office 2021 still supported?

No. Office 2021 and Office LTSC 2021 reached end of support on October 13, 2026, and Microsoft offers no extended security updates for them.

Will Office 2021 stop working after end of support?

Normally, no. Office 2021 continues to open, edit and save files, but new security vulnerabilities are no longer fixed.

Can I use my Office 2021 key to activate Office 2024?

No. Office keys are specific to the version and edition, so Office 2024 needs its own Office 2024 key for the matching edition.

Do I need to uninstall Office 2021 before installing Office 2024?

Yes. Microsoft recommends removing earlier Office versions before installing Office LTSC 2024, and your documents remain on the PC after the apps are removed.

Does Office 2024 include Publisher?

No. Microsoft did not include Publisher in Office 2024 because Publisher is being retired and is no longer supported after October 2026.

Can Office 2021 open files created in Office 2024?

Yes. Both versions use the same file formats, but Excel functions introduced in Office 2024, such as TEXTSPLIT, typically show a #NAME? error in Excel 2021.

Office 2024 vs Office 2021 on a Mac: does Office 2024 work on macOS?

Yes. Office Home 2024 and Office Home & Business 2024 are available for Mac and run on the three most recent versions of macOS, while Office LTSC Professional Plus 2024 is Windows only.

Office 2024 vs 2021: is either one a subscription?

No. Both are one-time purchases. Office 2024 receives security updates until October 9, 2029, and neither gains new features the way a Microsoft 365 subscription does.

When does Office 2024 support end?

October 9, 2029. Microsoft states that both retail Office 2024 and Office LTSC 2024 reach end of support on that date, with no extended support phase for LTSC.