Description
This is a retail product key for Microsoft Office 2021 Professional Plus on one Windows 10 or Windows 11 PC. It suits home users and small offices who want the full desktop suite, including Access and Publisher, with no subscription. The key arrives by email after payment, and activation runs online.
What's included in Office 2021 Professional Plus
Office 2021 Professional Plus includes seven desktop apps, installed locally on your PC. It is the most complete Office 2021 edition for Windows.
- Word 2021 for documents, with an improved accessibility checker and track changes.
- Excel 2021 with XLOOKUP, LET and dynamic array functions such as FILTER, SORT and UNIQUE.
- PowerPoint 2021 for presentations, with new transitions and recording tools.
- Outlook 2021 for email, calendar and contacts.
- OneNote for notes and digital notebooks.
- Access 2021 for building desktop databases and reports.
- Publisher 2021 for flyers, newsletters and print layouts.
Microsoft Teams is not part of this licence. It is a separate free download from Microsoft if you need it.
Licence details
| Product | Microsoft Office 2021 Professional Plus |
|---|---|
| Licence type | Retail, perpetual licence (one-time purchase, transferable) |
| Devices | 1 Windows PC |
| Platform | Windows 10 or Windows 11 |
| Activation | Online, by entering the 25-character product key |
| Delivery | Product key sent by email |
| Language | Multi-language, works worldwide |
| Microsoft support status | Microsoft ended support on 13 October 2026. The software keeps working and activating, but receives no further security updates. |
A retail licence is not tied to one motherboard. If you replace your PC, you can uninstall Office from the old machine and activate it on the new one. LicenceHouse covers every key with a 30-day software warranty.
System requirements
- Windows 10 (version 2004 or later) or Windows 11
- 1.1 GHz or faster dual-core processor
- 4 GB RAM for 64-bit, 2 GB for 32-bit
- 4 GB of free disk space
- 1280 × 768 screen resolution
- Internet connection for download and activation
How to download, install and activate
The whole process uses the Click-to-Run installer and an online key check. Our Office 2021 Professional Plus installation guide shows each step with screenshots.
- Uninstall any older Office version or Office trial from the PC first. Mixed versions often cause activation errors.
- Download the Office 2021 Professional Plus installer as described in the guide.
- Run the setup file. The Click-to-Run installer downloads and installs all apps.
- Open Word, go to File, then Account, and choose to change or enter a product key.
- Enter your key from the email and confirm. Office activates online within a few seconds.
If online activation is refused, check that no other Office edition is installed. You can also email support@licencehouse.com for activation help.
Office 2021 Professional Plus or Office 2024?
Choose Office 2021 if you need Publisher or a familiar version for a short-term project. Choose Office 2024 if the PC will stay online and needs ongoing security updates, which Office 2021 stopped receiving on 13 October 2026.
| Feature | Office 2021 Pro Plus | Office 2024 Pro Plus |
|---|---|---|
| Publisher | Included | Not included |
| Access | Included | Included |
| Security updates | Ended 13 October 2026 | Until 9 October 2029 |
| Windows support | Windows 10 and 11 | Windows 11 |
For longer support, see Office 2024 Professional Plus for Windows. If you do not need Access, Office 2024 Standard is a smaller suite. You can check dates on Microsoft's product lifecycle pages.
Frequently asked questions
Has Office 2021 stopped working now that support has ended?
No. Office 2021 keeps opening, editing and saving files after support ended on 13 October 2026. The change is that Microsoft no longer releases security fixes for it. For a PC that handles email and internet files every day, we recommend Office 2024, which receives security updates until October 2029.
Is Office 2021 Professional Plus a subscription?
No. It is a one-time purchase with a perpetual licence, so there is no monthly or yearly fee. You do not get the new features that Microsoft 365 subscribers receive. Your apps stay on the Office 2021 feature set, which is enough for most office work.
Can I move this Office 2021 key to a new computer?
Yes. This is a retail licence, so it is not locked to the hardware of the first PC. Remove Office from the old computer, then install and activate it on the new one. If online activation fails after a move, contact our support team by email.
What is the difference from the phone activation listing?
This listing activates online by typing the key in Word or Excel. The Office 2021 Pro Plus phone activation key installs the same apps but needs a short call to Microsoft's automated line. Choose online activation if you want the simplest setup.
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