Microsoft 365 vs Office 2021 in 2026: Which Should You Buy Now?
The Microsoft 365 vs Office 2021 debate has a new dimension in 2026: Office 2021's mainstream support ends in October 2026. That's a significant change from when this comparison was straightforward. Does it mean you should avoid Office 2021 entirely? Not necessarily — but it does change the maths. Here's the complete, updated picture for anyone making this decision right now.
What's Actually Changing in October 2026?
Microsoft's support lifecycle for Office 2021 has two phases: mainstream support (ends October 2026) and extended support (ends October 2026 — same date, unusually). This means after October 2026, Office 2021 receives no further security patches, no bug fixes, and no feature updates from Microsoft. The software continues to work — your documents don't disappear — but you're running unpatched software on an internet-connected machine, which carries security risk over time.
Office 2021 End of Support: October 14, 2026
After October 14, 2026, Microsoft will no longer release security updates for Office 2021. The apps will continue to function, but vulnerabilities discovered after that date will remain unpatched. For users handling sensitive data or running Office in a business environment, this is a meaningful consideration.
The Updated Cost Comparison for 2026
With the end-of-support date now imminent, the cost comparison shifts. If you buy Office 2021 today at a discounted price (say £42.99 for Pro Plus), you're buying roughly 6 months of fully supported use before the October 2026 cutoff. After that, you're using unsupported software. Microsoft 365 Personal, by contrast, is continuously updated and supported indefinitely — and at current discounted prices, costs around £21.99/year. Over two years, that's £43.98 — comparable to a one-time Office 2021 purchase, but with ongoing updates, 100GB OneDrive, and Teams included.
Microsoft 365 vs Office 2021: Updated 2026 Comparison
Who Should Still Buy Office 2021 in 2026?
Despite the approaching end-of-support date, Office 2021 still makes sense for specific use cases. Air-gapped or offline environments — machines that are never connected to the internet — don't benefit from security patches anyway, so the end-of-support date is irrelevant. Businesses with strict software version control policies may need a fixed, unchanging version of Office for compatibility reasons. Users who genuinely only need basic Word, Excel and PowerPoint functionality and have no interest in cloud features or AI tools. And anyone who philosophically prefers owning software outright over subscribing.
Who Should Choose Microsoft 365 in 2026?
Microsoft 365 is the better choice for the majority of users in 2026. If you use Office on more than one device, the multi-device support alone justifies the subscription. If you want the latest features — including Microsoft Copilot AI, which is now deeply integrated into Word, Excel and PowerPoint — only Microsoft 365 gets those updates. If you need cloud storage, the included 100GB OneDrive replaces a separate storage subscription. And critically, if you want to remain on supported, patched software beyond October 2026, Microsoft 365 is the only option.
What About Office 2024?
Microsoft released Office 2024 as a perpetual licence option with support running until October 2029. It's a middle ground: a one-time purchase with a longer support window than Office 2021. Office 2024 Home & Business includes Word, Excel, PowerPoint and Outlook for Mac and PC. It doesn't include Access or Publisher (those are Pro Plus only), and it still lacks Teams and the continuous Copilot updates that Microsoft 365 subscribers get. At around £64.99 discounted, it's priced between Office 2021 and a multi-year Microsoft 365 subscription.
The Microsoft Copilot Factor
In 2026, Microsoft Copilot is no longer a novelty — it's a genuinely useful productivity tool built into Word, Excel and PowerPoint for Microsoft 365 subscribers. It can draft documents, summarise emails, analyse spreadsheet data, and generate presentation slides from prompts. Office 2021 users get none of this. If AI-assisted productivity matters to you, Microsoft 365 is the only path to these features.
Frequently Asked Questions
The 2026 Verdict
For most users buying Office software in 2026, Microsoft 365 Personal is the stronger choice — especially with Office 2021's end-of-support date now just months away. The continuous updates, multi-device support, 100GB OneDrive, and Copilot AI features make it better value over a 2–3 year horizon. That said, Office 2021 and Office 2024 remain excellent options for specific use cases. EvelopKeys stocks all three at up to 85% off retail price, with instant delivery and lifetime replacement guarantees.
