Microsoft Office 2021 keys for Windows: genuine Office Professional Plus 2021 licenses for 1 PC, 5 PCs, Microsoft account binding, phone activation and LTSC. One-time purchase with instant email delivery. Note that Microsoft ends Office 2021 support on October 13, 2026.
Microsoft Office 2021: Which License Should You Choose?
Microsoft Office 2021 is a one-time-purchase version of Office for Windows. It gives you Word, Excel, PowerPoint, Outlook and, in Professional Plus, Access and Publisher, without a Microsoft 365 subscription.
Every license on this page installs the same Professional Plus suite. What differs is how many PCs the key covers, how it activates and whether it is a retail or volume-licensed build. This guide helps you pick the right one, and tells you plainly when Office 2024 is the smarter buy.
Microsoft Office 2021: Quick Answer
Here is the current position as of September 2026:
- All five Office 2021 licenses here are for Windows 10 and Windows 11
- Each is a perpetual license: you pay once, with no renewal
- Keys are delivered by email, usually instantly
- Microsoft ends support for Office 2021 and Office LTSC 2021 on October 13, 2026
- There is no Extended Security Updates program for Office 2021
- Office 2024 and Office LTSC 2024 are supported until October 2029
End of support does not stop Office 2021 from working. It means security updates and Microsoft technical support stop.
Compare Microsoft Office 2021 Licenses
Use this table to match a license to your situation:
| Product | PCs | Activation | Best for |
|---|---|---|---|
| Office 2021 Professional Plus | 1 | Online | A single home or work PC |
| Office 2021 Professional Plus 5PC | Up to 5 | Online, per PC | Families and small offices |
| Office 2021 Professional Plus Bind Key | 1 at a time | Linked to your Microsoft account | Easy reinstalls and PC changes |
| Office 2021 Pro Plus Phone Activation | 1 | Phone / Confirmation ID | Offline or restricted PCs |
| Office 2021 Pro Plus LTSC | 1 | Online, volume build | Businesses matching an LTSC 2021 setup |
If you are unsure, the single-PC Office 2021 Professional Plus key is the simplest starting point.
What Is Included in Microsoft Office 2021 Professional Plus?
All the licenses above install the Professional Plus app set:
- Word, Excel and PowerPoint
- Outlook and OneNote
- Access for desktop databases
- Publisher for print layouts
- Teams in retail builds, or Skype for Business in the LTSC build
Microsoft has announced Publisher's retirement in October 2026. Installed copies keep working, but it is worth planning another tool for future layout work.
Key Microsoft Office 2021 Features
Office 2021 is an evolution rather than a reinvention. The most useful improvements are:
- XLOOKUP, LET and dynamic arrays in Excel
- Line Focus and full dark mode in Word
- Presenter video and ink recording in PowerPoint
- Built-in message translation in Outlook
- Real-time co-authoring for files in OneDrive or SharePoint
- OpenDocument Format 1.3 support
Office 2021 does not include Copilot, and it does not gain new features after release. What you install is what you keep, which some users see as a limitation and others as a feature.
Is Microsoft Office 2021 Still Worth Buying in 2026?
Sometimes. With support ending on October 13, 2026, Office 2021 is no longer the default recommendation for a new long-term PC.
Office 2021 still makes sense when you:
- Need to match other PCs already running Office 2021
- Use an add-in or template certified for this version
- Run an offline PC with limited exposure to email and the web
- Plan to replace the computer within a year or two
Consider Office 2024 instead when you:
- Want security updates until 2029
- Are setting up a new PC for several years of use
- Only need the core apps for home use
The Office 2024 range includes home, business and LTSC editions, and Office 2024 Professional Plus LTSC is the closest successor to Office 2021 Professional Plus.
Microsoft Office 2021 vs Office 2024 at a Glance
| Area | Office 2021 | Office 2024 |
|---|---|---|
| License type | One-time purchase | One-time purchase |
| Support ends | October 13, 2026 | October 2029 |
| Windows support | Windows 10 and 11 | Windows 10 and 11 |
| Best reason to choose it | Matching an existing 2021 setup | Longer support for new PCs |
How to Activate Microsoft Office 2021
Activation depends on the license you buy:
- Uninstall any trial or older Office version.
- Install Office 2021 from the official Microsoft source in your order email.
- Enter your key in File → Account → Change Product Key, or redeem a bind key to your Microsoft account.
- For phone activation, copy the Installation ID and use the Bcdkey Get Confirmation ID tool.
- Confirm that File → Account shows Office as activated.
Our guide on how to activate Microsoft Office by phone walks through each screen. Microsoft's Office end-of-support resources page lists the official lifecycle dates.
Using a Mac?
The Office 2021 licenses in this category are Windows-only. Mac users should look at Microsoft Office 2021 Home and Business for Mac or the Office for Mac range.
FAQ About Microsoft Office 2021
Is Microsoft Office 2021 a one-time purchase?
Yes. Every Office 2021 license here is perpetual, so there is no monthly or yearly subscription.
When does Microsoft Office 2021 support end?
October 13, 2026. After that date, Microsoft stops security updates and technical support for Office 2021 and Office LTSC 2021.
Will Office 2021 stop working after support ends?
No. The apps keep working, but they no longer receive security fixes.
Which Office 2021 key should I buy for several PCs?
The Office 2021 Professional Plus 5PC key covers up to five Windows PCs with one key. For larger numbers, the Bcdkey B2B wholesale program may suit you better.
What is the difference between Office 2021 retail and LTSC?
Retail Office 2021 is sold to consumers and includes Teams. Office LTSC 2021 is a volume-licensed build for organizations that includes Skype for Business and installs with the Office Deployment Tool.
Where can I find my Office 2021 key after purchase?
Your key is sent by email and saved in My Account. If you need help, open a support ticket.
Final Thoughts
Choosing Microsoft Office 2021 is less about features and more about timing. The suite is capable and familiar, but its support window closes on October 13, 2026.
Choose Office 2021 when you need to match an existing setup or a short-lived PC; choose Office 2024 when you want years of security updates. When you are ready, compare the licenses above or browse the full Microsoft Office collection on Bcdkey.