Buy a genuine Office 2021 Professional Plus key or Office 2021 Home & Business for Mac as a one-time purchase. Office 2021 is the last version with Publisher and costs less than Office 2024. Keys activate online and arrive by email within minutes.
| Licence | Platform | Devices | Activation |
|---|---|---|---|
| Office 2021 Professional Plus | Windows | 1 PC | Product key |
| Office 2021 Professional Plus (Download Link + Key) | Windows | 1 PC | Product key |
| Office 2021 Professional Plus – 5 PC | Windows | 5 PCs | Product keys |
| Office 2021 Home & Business for Mac | macOS | 1 Mac | Microsoft account |
Microsoft support for Office 2021 ended on October 13, 2026, and Microsoft is not offering Extended Security Updates. A perpetual licence never expires, so Office 2021 keeps working, but it no longer receives security fixes. It remains a sensible buy for offline PCs, matching existing 2021 installations, and anyone who still needs Publisher. For a supported version, choose Office 2024 Professional Plus.
| Office 2021 Pro Plus | Office 2024 Pro Plus | |
|---|---|---|
| Security updates | Ended October 13, 2026 | Until October 9, 2029 |
| Publisher | Included | Not included |
| New Excel functions (TEXTSPLIT, VSTACK, IMAGE) | No | Yes |
| Price | Lower | Higher |
Both include Access and Publisher. Professional Plus is the edition licensed to organisations and also adds Skype for Business. For home and small-business use, the everyday apps are the same.
Remove other Office versions, download ProPlus2021Retail.img from Microsoft, run Setup.exe, then enter your key under File → Account. Mac users redeem their key at setup.office.com and sign in. See the Office 2021 Professional Plus guide and the Office 2021 for Mac guide.
No. It is a lifetime licence for that PC. Only Microsoft's support ended, which means no further security updates.
No. On a Mac, choose Office 2021 Home & Business for Mac or Office 2024 Home & Business.
Office 2024 for ongoing security updates and new Excel features; Office 2021 if you need Publisher or want the lower price for an offline PC.
Each key activates one PC. The 5-PC licence covers five machines in one order.
Yes. It installs and runs on Windows 10 and Windows 11.
| Resource | Link |
|---|---|
| Office 2021 Pro Plus key | Buy Office 2021 Professional Plus |
| 5-PC licence | Office 2021 Pro Plus 5 PC |
| Install guide | Install Office 2021 Pro Plus |
| Supported version | Office 2024 keys |
| Support dates (Microsoft) | Office LTSC 2021 lifecycle |
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