Office 2021 vs Office 2024 Pro Plus: Is the Upgrade Worth It for UK Users in 2026?
Office 2021 vs Office 2024: The Upgrade Decision UK Users Face
Microsoft Office 2021 has served millions of UK users well, but Office 2024 Pro Plus is now the latest perpetual release. If you bought an Office 2021 licence and are wondering whether to upgrade — or if you are choosing between the two for a new PC — this guide gives you the honest comparison. No marketing spin. Just the features, costs, and real-world differences that matter for UK homes and businesses.
What Office 2021 Pro Plus Offers Today
Office 2021 Pro Plus includes the core applications most UK users know:
- Word, Excel, PowerPoint, Outlook — the essential four
- Access and Publisher — included in the Pro Plus edition
- One-time purchase — no recurring subscription
- Security updates through October 2026 — mainstream support ends 13 October 2026
For UK users who bought Office 2021 at launch, the clock is ticking. Mainstream support ends in October 2026, meaning no more feature updates and eventually no security patches. That is a real concern for businesses handling sensitive data.
What Office 2024 Pro Plus Adds
Office 2024 Pro Plus is not a radical redesign, but the improvements are meaningful:
- Performance improvements — faster launch times and smoother operation on modern hardware
- New Excel functions — including REGEXEXTRACT, REGEXTEST, and improved dynamic arrays
- Outlook redesign — the new Outlook experience with better search and calendar integration
- Loop components in Word and Outlook — collaborative building blocks that sync across apps
- Improved accessibility — better screen reader support and high-contrast themes
- Security updates through October 2029 — five full years of patches
- Dark mode across all apps — proper dark theme, not the half-hearted version in 2021
The security timeline is the most important difference. Office 2021 loses mainstream support in October 2026. Office 2024 gets security updates until October 2029. That is three extra years of protected computing.
Feature-by-Feature Comparison
| Feature | Office 2021 Pro Plus | Office 2024 Pro Plus |
|---|---|---|
| Security Support End | October 2026 | October 2029 |
| Dark Mode | Partial | Full |
| Loop Components | Not available | Included |
| New Outlook | Classic only | New + Classic |
| REGEX Functions (Excel) | Not available | Included |
| Performance | Standard | Improved |
| One-Time Purchase | Yes | Yes |
| Subscription Required | No | No |
Cost Comparison: What UK Buyers Actually Pay
Both are available as one-time purchases — no subscription required. For UK buyers, the price difference is minimal when you consider the additional three years of security support:
Who Should Stick With Office 2021
Stay on Office 2021 if:
- You only use Word and Excel for basic tasks (letters, simple spreadsheets)
- You plan to replace your PC within the next 12 months — upgrade then
- Your organisation uses Office 2021 across all machines and needs consistency
- Budget is extremely tight and Office 2021 still meets your needs
Just remember: after October 2026, Office 2021 receives no more security patches. If you handle financial data, client information, or anything sensitive, running unsupported software is a compliance risk.
Who Should Upgrade to Office 2024
Upgrade to Office 2024 Pro Plus if:
- You want security updates through 2029 — the single biggest reason
- You use Excel heavily and want REGEX functions and improved dynamic arrays
- You prefer the new Outlook experience
- You want proper dark mode across all apps
- You are setting up a new PC — always start with the latest version
- You collaborate with others using Loop components
Can You Open Office 2024 Files in Office 2021?
Generally yes — Microsoft maintains backward compatibility for the core file formats (.docx, .xlsx, .pptx). However, features specific to Office 2024 (like Loop components) will not render in Office 2021. The files open, but some content may appear differently or be missing.
The Upgrade Process
Upgrading from Office 2021 to Office 2024 is straightforward:
- Uninstall Office 2021 — use the Microsoft Support and Recovery Assistant or Settings > Apps
- Download Office 2024 — from your Microsoft account or the deployment tool
- Enter your new product key — activate with your genuine Office 2024 key
- Sign in to your Microsoft account — to link the licence
- Allow updates to install — the first update may take 10–15 minutes
Your existing files, templates, and Outlook data carry over automatically.
Frequently Asked Questions
Is Office 2024 Pro Plus a subscription?
No. Office 2024 Pro Plus is a one-time purchase. You pay once and own the licence for the lifetime of the product. There is no monthly or annual fee.
Will Office 2021 stop working after October 2026?
Office 2021 will continue to work after mainstream support ends, but it will no longer receive security updates. This makes it increasingly risky to use, especially for internet-connected PCs handling sensitive data.
Can I install Office 2024 alongside Office 2021?
Microsoft does not recommend running two versions of Office side by side. Uninstall Office 2021 first, then install Office 2024.
Does Office 2024 include Microsoft Teams?
Office 2024 Pro Plus does not include a full Teams licence. You can use the free version of Teams, but for the full business experience you need a separate Microsoft 365 subscription.
How many devices can I install Office 2024 on?
A single Office 2024 Pro Plus licence covers one device. If you need multiple devices, consider Office 365 Pro Plus Lifetime (5 Devices) or purchase separate licences.
The Verdict
If you are buying new, Office 2024 Pro Plus is the clear choice — three more years of security support, better performance, and modern features for roughly the same price. If you already own Office 2021 and it meets your needs, you can wait — but plan your upgrade before October 2026, when security patches stop. The risk of running unsupported Office software in 2027 and beyond is not worth taking, especially for UK businesses with GDPR and data protection obligations.
