If you are looking at three different Office listings and wondering what actually separates them, you are not alone. All three are one-time purchases, all three install Word, Excel, PowerPoint and the rest, and the differences are rarely obvious from a product page.
The honest answer in late 2026 is that this decision has less to do with features than most buyers expect, and far more to do with two dates on Microsoft’s support calendar. Here is what actually changes between the versions, what each one costs, and which one fits your machine. Every price below was checked against our live catalogue on 26 September 2026.
Quick Answer
Buy Office 2024 if the computer stays connected to the internet. It is the only one of the three with security updates running past October 2026. Office 2021 reaches end of support on 13 October 2026, which is a matter of weeks from now, and Office 2019 passed that point on 14 October 2025.
Office 2019 and 2021 still make sense in two situations: an older PC that cannot run Office 2024, or a machine that never goes online. Outside those two cases, buying a version whose security updates have already stopped is a false economy.
Office 2019 vs 2021 vs 2024 at a Glance
| Office 2019 | Office 2021 | Office 2024 | |
|---|---|---|---|
| Security updates end | 14 October 2025 (passed) | 13 October 2026 | October 2029 |
| Runs on Windows 10 | Yes | Yes | No, Windows 11 required |
| Runs on Mac | Yes, older macOS | Yes | macOS Ventura or newer |
| Co-authoring in desktop apps | No | Yes | Yes |
| Dynamic arrays and XLOOKUP in Excel | No | Yes | Yes, extended |
| Copilot or cloud AI | No | No | No |
| Our price | $99.99 | $179.99 | $178.99 (Home, no Outlook) |
| Microsoft list price | $339.99 | $439.99 | $260.00 |
Support Timelines Matter More Than the Feature List
This is the part most buying guides skip, and in 2026 it is the whole decision.
“End of support” does not mean the software stops working. Your licence is still yours, the apps still open, and your files are unaffected. What stops is Microsoft shipping security patches. For a machine that opens email attachments and downloads files, that is not a small detail. An unpatched Office install is one of the more common ways a small business PC gets compromised.
Office 2021 has weeks of security updates left, not years. If you are buying today for a computer that goes online, that is the single most important fact on this page.
If the machine is genuinely offline, a till system, a workshop PC, a machine that only ever prints invoices, then end of support costs you nothing and Office 2019 at $99.99 is good value. That is a narrow case, and it is worth being honest with yourself about whether your computer really is one of them.
Feature Differences Between the Three Versions
Office 2019 introduced dark mode, better inking tools and the first wave of newer Excel functions such as TEXTJOIN and IFS. Office 2021 added real-time co-authoring in the desktop apps, dynamic arrays and XLOOKUP in Excel, and a cleaner ribbon. Office 2024 refines the dynamic array functions further, updates the meeting tools in Outlook and improves search across the suite.
For most people the practical gap between 2021 and 2024 is small. The gap between 2019 and either of the newer two is noticeable if you live in Excel, because dynamic arrays and XLOOKUP genuinely change how you build a spreadsheet.
None of the three include Copilot or any cloud AI feature. That is reserved for Microsoft 365 subscriptions. If AI in Word and Excel is what you are after, no perpetual licence will give it to you, and it is worth reading how Microsoft 365 against an Office 2024 perpetual licence before you spend anything.
System Requirements Decide This for a Lot of People
Office 2024 requires Windows 11, or macOS Ventura and newer. Office 2019 and 2021 both run comfortably on Windows 10 and on older Macs.
So if your PC has not been upgraded past Windows 10 and cannot be, the decision is already made for you: Office 2021 is your ceiling. If your machine can take Windows 11 but has not been upgraded yet, that upgrade is free from Microsoft and worth doing first, because it opens up the version with five more years of support behind it.
What Each Version Costs
Prices move, so treat these as a snapshot taken on 26 September 2026 rather than a permanent quote. The pattern behind them is stable though: Microsoft prices each release lower once a newer one exists, which is why an older version is cheaper than a current one rather than worse than it.
- Office Professional Plus 2019 at $99.99, against a $339.99 list price
- Office Professional Plus 2021 at $179.99, against a $439.99 list price
- Office 2024 Home at $178.99, against a $260.00 list price
- Office Home and Business 2021 for Mac at $124.99 for Mac users
Notice what that ladder does at the top. Office Professional Plus 2021 and Office 2024 Home sit within a dollar of each other. If you were choosing between those two on price alone, there is nothing to choose, and the support calendar should make the decision instead.
The catch is what each edition includes. Professional Plus 2021 carries Outlook, Publisher and Access. Office 2024 Home does not include Outlook. Office 2024 Home and Business, which does include Outlook, is temporarily out of stock as this is published. If Outlook is essential and you want the 2024 generation, contact us through the contact page and we will tell you where that stands rather than have you guess.
Which One Should You Buy?
| Your situation | Buy this | Why |
|---|---|---|
| Windows 11 PC, want it to last | Office 2024 | Security updates to 2029 |
| Windows 10 PC that cannot upgrade | Office 2021 | Newest version your machine will run |
| Need Outlook, Publisher or Access | Office Professional Plus 2021 | Office 2024 Home has no Outlook |
| Mac on Ventura or newer | Office 2024 | Same support runway as Windows |
| Older Mac | Office Home and Business 2021 for Mac | Runs on older macOS |
| Fully offline machine, tight budget | Office 2019 | End of support costs you nothing offline |
| You want Copilot and cloud AI | None of these | Perpetual licences do not include it |
If you already own an older version and just need help getting it running again, the install and activation walk-through covers download, install and activation in order.
The Bottom Line
In 2026 this stopped being a feature comparison. Office 2019 is out of support, Office 2021 goes out of support in October, and Office 2024 is the only one of the three with years left on the clock. Let your hardware set the ceiling, then buy the newest version that fits under it.
Every option here is a genuine, one-time purchase with lifetime support behind it. If you are still weighing subscription against perpetual, our guide to buying Microsoft Office without a subscription works through that separately.
Frequently Asked Questions
Is Office 2021 still worth buying in 2026?
Only in specific cases. Office 2021 reaches end of support on 13 October 2026, so security updates stop within weeks of this being published. It remains a sensible buy if your PC runs Windows 10 and cannot be upgraded to Windows 11, because Office 2024 will not install on it, or if you need Outlook, Publisher and Access in a perpetual licence. For a Windows 11 machine that stays online, Office 2024 is the better purchase at almost the same price.
What is the difference between Office 2019, 2021 and 2024?
The practical differences are support dates and system requirements rather than features. Office 2019 lost security updates on 14 October 2025, Office 2021 loses them on 13 October 2026, and Office 2024 is supported to October 2029. Office 2024 requires Windows 11 or macOS Ventura, while 2019 and 2021 run on Windows 10. Feature-wise, 2021 added desktop co-authoring and Excel dynamic arrays including XLOOKUP, and 2024 extended those further. None of the three include Copilot or cloud AI.
Does Office 2024 include Outlook?
It depends on the edition. Office 2024 Home does not include Outlook. Office 2024 Home and Business does. If Outlook matters to you, check which edition a listing actually refers to before buying, because the two are often shown side by side at similar prices.
Can I still use Office 2019 after end of support?
Yes. Your licence does not expire and the applications keep working exactly as before. What stops is Microsoft issuing security patches. On a computer that connects to the internet and opens email attachments, running unpatched Office is a real risk. On a machine that is genuinely offline, it makes no practical difference.
Will Office 2024 run on Windows 10?
No. Office 2024 requires Windows 11 on PC, or macOS Ventura and newer on Mac. If your computer is still on Windows 10 and cannot be upgraded, Office 2021 is the most recent version you can install.
Is a one-time Office purchase cheaper than Microsoft 365?
Over anything longer than about two years, usually yes, because a perpetual licence has no recurring cost. The trade-off is that you do not get Copilot, cloud storage or feature updates, and you will eventually reach an end-of-support date. Which is better depends on whether you value the newest features or the absence of a monthly bill.
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