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Buy Microsoft Office 2021 Professional Plus — Lifetime Licence for Windows PC
Microsoft Office 2021 Professional Plus is a standalone productivity suite for Windows sold as a one-time purchase, with no subscription at any point. It gives you Word, Excel, PowerPoint, Outlook, OneNote, and Access on one PC under a perpetual licence. Keys are delivered by email after payment clears, and installation and activation support is included at no extra cost.
What's included in Office 2021 Professional Plus?
This edition includes the full professional application set for Windows:
- Word 2021: Real-time co-authoring, improved Dark Mode, new Draw tab tools (Point Eraser, Ruler, Lasso), and general performance improvements.
- Excel 2021: XLOOKUP, XMATCH, dynamic arrays, the LET function, and new chart types including the Funnel chart.
- PowerPoint 2021: New slide transitions, improved co-authoring, an expanded stock media library, and Sketched style shapes.
- Outlook 2021: Email, calendar, and contacts with faster search and a refreshed Fluent Design interface.
- OneNote 2021: Digital notebook for notes and to-do lists, synced across devices.
- Access 2021: Relational database building with query, form, and reporting tools. Access is exclusive to Professional Plus and is not in Home & Business or Home & Student.
Publisher and Teams are not part of this licence. Teams is a separate free download from Microsoft. This suite is Windows-only and will not install on macOS, Android, or ChromeOS. If you need Office on a Mac, see Office 2021 Home & Business for Mac.
Important: Office 2021 support ends in October 2026
Microsoft's support for Office 2021 ends on 13 October 2026. After that date the software keeps working indefinitely — a perpetual licence does not expire — but Microsoft stops issuing security updates and bug fixes for it.
That matters differently depending on how you work. For a home or offline machine, Office 2021 remains a sound buy at a lower price. For a business handling client data or working under a compliance policy, running an unpatched Office suite is usually not acceptable, and Office 2024 Professional Plus is the better choice — it is supported into 2029.
Licence details
| Licence specification | Details |
|---|---|
| Licence type | Retail, one-time purchase (perpetual) |
| Devices covered | 1 PC, Windows only |
| Delivery method | Email — product key, download link, and invoice |
| Activation | Online, or by phone through Microsoft's activation servers |
| Subscription required? | No. One payment, no recurring fees. |
| Compatibility | Windows 10 and Windows 11 (32 & 64-bit) |
| Mac compatible? | No — Windows only |
| Languages | All languages included (global key) |
| Support included | Installation and activation support |
| Replacement warranty | 30 days |
System requirements
| Requirement | Minimum specification |
|---|---|
| Operating system | Windows 10 or Windows 11 (32-bit & 64-bit) |
| Processor | 1.6 GHz, 2-core or faster |
| RAM | 4 GB (64-bit), 2 GB (32-bit) |
| Storage | 4 GB available disk space |
| Display | 1280 × 768 resolution |
| Internet | Required for activation only — fully offline afterwards |
| Graphics | DirectX 9 or later with WDDM 2.0 driver |
Full requirements are published on Microsoft's Office 2021 system requirements page.
How to download, install, and activate
- Check your email. Your order confirmation contains the product key, the official Microsoft download link, and activation instructions.
- Download the installer. Use the supplied link to pull the Office 2021 installation media directly from Microsoft's servers.
- Run the setup wizard. Follow the on-screen prompts to install on your Windows PC.
- Enter your product key. Activate online, or by phone if prompted.
- Done. The suite is activated with no time limit and no further steps.
If activation fails, the usual cause is an edition mismatch — a Professional Plus key entered against a Home & Business installation will be rejected even though the key is valid. Check which edition you installed before assuming the key is faulty. Our support team can walk you through it.
Office 2021 or Office 2024 — which should you buy?
| Feature | Office 2021 Professional Plus | Office 2024 Professional Plus |
|---|---|---|
| Word, Excel, PowerPoint, Outlook, OneNote, Access | Included | Included |
| Dynamic arrays & XLOOKUP in Excel | Included | Included, extended |
| Platform | Windows only | Windows only |
| Microsoft support ends | October 2026 | October 2029 |
| Best for | Home and offline use where price matters most | Business use, and anyone who needs ongoing security updates |
Frequently asked questions
Does this licence expire?
No. It is a perpetual licence, so the software continues to run for as long as you use the PC. What ends in October 2026 is Microsoft's support — security patches and fixes — not your right to use the software.
Can I move the key to a new computer?
Retail Office licences can generally be transferred to a replacement PC after being deactivated on the old one, unlike OEM licences which stay tied to their original hardware. Transfer terms are set by Microsoft's licence agreement and can vary by region, so check the terms supplied with your key.
What is the difference between Professional and Professional Plus?
Professional Plus adds Access and is the fuller of the two suites. If you need database work, Professional Plus is the edition to buy.
Will this work alongside Microsoft 365?
Running a perpetual Office install and a Microsoft 365 install on the same PC frequently causes conflicts, and Microsoft advises against it. Remove the existing installation before installing this one.
How many PCs does one key cover?
One. For multiple machines, see Office 2021 Pro Plus 5-PC licence keys.
Why buy from MicrosoftSoftwareSwap
- Genuine Microsoft keys that activate against Microsoft's own servers.
- Fast email delivery — key, download link, and invoice sent once payment clears.
- 30-day replacement warranty if a key fails to activate.
- Installation and activation support included at no extra charge.
- No subscription and no renewals. Pay once.
- Secure encrypted checkout with multiple payment options.
Related products
- Office 2024 Professional Plus
- Office 2021 Home & Business
- Office 2021 Home & Business for Mac
- Office 2019 Professional Plus
- Windows 11 Pro
- Visio 2021 Professional
Order Office 2021 Professional Plus today and your product key arrives by email, ready to activate.
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