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Microsoft Office Professional 2021

✔ Genuine Microsoft Software Keys

How to Download, Install & Activate
Microsoft Office 2021 Professional Plus

Complete step-by-step guide to download, install and activate Microsoft Office 2021 Professional Plus on Windows or Mac. Genuine product key — instant delivery across USA & Canada.

🖥 Windows & Mac ⚡ Instant Delivery 🔑 Lifetime License 🛡 Lifetime Warranty 🏆 Most Complete Suite

Microsoft Office 2021 Professional Plus is the most powerful and complete edition of the Office 2021 suite — a comprehensive collection of professional programs for working with documents, spreadsheets, presentations, email, databases, and more. Before you download Microsoft Office 2021 Professional Plus, it is important to ensure your computer meets the minimum system requirements for a smooth, error-free installation on both Windows and Mac.

What You Get
Apps Included in Office 2021 Professional Plus

📦 Eight Powerful Apps — One Key, One Device, Lifetime License

W Word 2021
X Excel 2021
P PowerPoint 2021
Outlook 2021
N OneNote 2021
A Access 2021
U Publisher 2021
S Skype for Business
System Requirements
System Requirements for Office 2021 Professional Plus — Windows & Mac
🖥 Windows PC — System Requirements
Operating SystemWindows 10 or Windows 11 (newer recommended)
Internet ConnectionBroadband connection, minimum 20 Mbps download speed
Processor1.6 GHz or higher, dual-core
RAM4 GB (64-bit) · 2 GB (32-bit)
Free Disk Space4 GB minimum
Display1280 × 768 pixels minimum
LicenseOne-time purchase · 1 PC · Lifetime

⚠ Note: Office 2021 is not compatible with Windows 7 or Windows 8/8.1.

🍎 Mac — System Requirements
Operating SystemmacOS Big Sur (11.0) or later — Ventura & Sonoma supported
ProcessorIntel or Apple Silicon (M1/M2/M3) — natively supported
RAM4 GB minimum
Free Disk Space10 GB minimum
Display1280 × 800 pixels minimum
InternetStable connection required for activation and updates
LicenseOne-time purchase · 1 Mac · Lifetime

ℹ Note: Windows and Mac versions use separate product keys. Confirm your platform before purchasing.

Before Installing
How to Uninstall the Previous Version of Microsoft Office

🗑 Remove Any Previous Office Version First (Recommended)

🖥 Windows — Uninstallation Process

  1. Open the Control Panel from the Start menu.
  2. Select Programs → Programs and Features.
  3. Find Microsoft Office in the list, right-click it, and select Uninstall.
  4. Follow the uninstallation wizard instructions and wait for the process to complete.
⏱ Note: The process may take several minutes depending on your computer's configuration.

🍎 Mac — Uninstallation Process

  1. Open Finder on your Mac.
  2. Go to the Applications folder.
  3. Find all Microsoft Office applications (Word, Excel, PowerPoint, etc.).
  4. Drag each one to the Trash, then Empty the Trash.
💡 Tip: Also remove associated support files from your user library for a completely clean installation.
🔄 System Restart Required: After uninstalling the previous Office version on either platform, restart your computer before proceeding with the Office 2021 installation. This completes the removal process and prevents installation conflicts.

🔑 Don't have a product key yet? Get your genuine Microsoft Office 2021 Professional Plus key at the best price — instant digital delivery across USA & Canada.

Buy Your Product Key Now →
Windows Guide
Download, Install & Activate on Windows PC
1

How to Download Office 2021 Professional Plus on Windows

🖥 Windows
1

Go to the official Microsoft website: setup.office.com.

2

Create a new Microsoft account or sign in to your existing one.

3

Enter the product key provided by MMKeys at the time of purchase to register your Office 2021 Professional Plus license.

4

Click Download to save the Office 2021 installation file to your PC.

5

You may see a security warning from your browser during the download — this is normal. The file downloads directly from Microsoft's content delivery network (officecdn.microsoft.com) and is completely safe.

2

How to Install Office 2021 Professional Plus on Windows

🖥 Windows
1

Go to your Downloads folder and locate the downloaded setup.exe file.

2

Double-click the file — the installation should start automatically.

⚠ File won't open? In rare cases on Windows 10 or 11, another program may be associated with this file type. If double-clicking does not start the installation:

1. Right-click the downloaded file and select Mount.
2. A new virtual disk will appear under This PC in Windows Explorer.
3. Open that disk to start the installation.

This is called mounting a disk image — similar to inserting a DVD.
⏳ Wait for the installation to complete. A progress bar will be shown. Do not close the window or restart during installation.
3

How to Activate Office 2021 Professional Plus on Windows

🖥 Windows
1

Open any newly installed Office application such as Word or Excel. If you can't find them, open the Windows Start menu — shortcuts to all Office apps will appear there.

2

When prompted, sign in with your Microsoft account — the same account used at setup.office.com.

3

Enter your 25-character product key from MMKeys when prompted. Check each character carefully to avoid typos.

4

Follow the on-screen prompts to complete activation. Office 2021 Professional Plus is now fully activated and all features are unlocked.

Mac Guide
Download, Install & Activate on Mac
1

How to Download Office 2021 Professional Plus for Mac

🍎 Mac
1

Go to the official Microsoft website: setup.office.com.

2

Create a new Microsoft account or sign in to your existing one.

3

Enter the product key provided by MMKeys to register your Office 2021 license and unlock the Mac download.

4

Click Download to save the Office 2021 installer .pkg file to your Mac.

2

How to Install Office 2021 Professional Plus on Mac

🍎 Mac
1

Open the Downloads folder on your Mac and find the Microsoft Office installer file with the .pkg extension.

2

Double-click the .pkg file to start the installation wizard.

3

Read the Software License Agreement and click Continue.

4

Choose how to install Microsoft Office for Mac. Review disk space requirements and change the installation location if needed, then click Install.

5

You may be prompted to enter your Mac login password — this is a standard macOS security procedure required to install software.

6

Wait for installation to complete. Once done, open any Office app — your software will be activated automatically using the key entered at setup.office.com.

💡 Apple Silicon: Office 2021 Professional Plus runs natively on M1, M2, and M3 chips — no Rosetta 2 required. Make sure macOS is fully up to date before installing.
✅ Mac activation is automatic: Once you have entered your product key at setup.office.com and completed the installation, all Office 2021 apps on your Mac activate automatically — you do not need to re-enter the key inside the apps.

🔑 If you haven't purchased a product key yet — get your genuine Microsoft Office 2021 Professional Plus key here at the best price.

Get Your Product Key Here →
Why Choose MMKeys
Trusted by Customers Across USA & Canada
🔑

100% Genuine Keys

Official Microsoft software product keys — authentic and guaranteed to activate.

⚡

Instant Delivery

Your digital activation code arrives by email seconds after payment — 24/7.

💰

Best Price Guarantee

Discounted Microsoft keys — best price without compromising authenticity.

🛡️

Lifetime Warranty

Every key carries a lifetime warranty. If it ever fails, we replace it free.

↩️

Money-Back Guarantee

Not satisfied? We offer a full money-back guarantee — no questions asked.

🎧

24/7 Support

Our team is always ready to help with installation, activation, or any issue.

FAQ
Frequently Asked Questions
While the Office 2021 installer can be downloaded from setup.office.com at no charge, a valid product key is required to activate and use the software. Without a genuine license, Office will run in reduced functionality mode. Get your genuine Office 2021 Professional Plus key from MMKeys for full activation at the best price.
No — Office 2021 Professional Plus is a perpetual lifetime license. Once purchased and activated, you can use the software indefinitely with no expiry date and no subscription fees. It is a one-time purchase that you own forever.
No — Office 2021 is fully supported by Microsoft. Microsoft is committed to providing security updates and technical support for Office 2021 until October 2026, giving you several more years of fully supported use.
Office 2021 updates automatically through Windows Update on PC. To check for updates manually:
  1. Open any Office application (e.g. Word or Excel).
  2. Go to File → Account → Update Options → Update Now.
On Mac, updates can be checked through Microsoft AutoUpdate, available in the Help menu of any Office app.
Office 2021 Professional Plus is the most complete edition — it includes Word, Excel, PowerPoint, Outlook, OneNote, Access, Publisher, and Skype for Business. Office 2021 Home & Business includes only Word, Excel, PowerPoint, Outlook, and OneNote. Professional Plus is the right choice for users who need Access and Publisher in addition to the core apps.
Yes — every key sold on MMKeys.com is a 100% genuine, official Microsoft software product key that activates directly on Microsoft's own servers at setup.office.com. We provide authentic software at the best price with a lifetime warranty and money-back guarantee on every purchase.
It is strongly recommended to uninstall any previous version of Microsoft Office before installing Office 2021 Professional Plus to avoid conflicts. On Windows, use Control Panel → Programs and Features. On Mac, drag Office apps to the Trash. Restart your computer after uninstalling before proceeding with the new installation.
MMKeys offers discounted Microsoft keys because we operate as an efficient digital marketplace with no physical packaging or shipping overhead. You get a genuine Office 2021 Professional Plus key at a fraction of the retail price — with instant delivery across the USA and Canada, lifetime warranty, and money-back guarantee included.

🔑 Ready to get the most complete Office 2021 suite? Buy your genuine Microsoft Office 2021 Professional Plus key now — instant delivery, best price, lifetime warranty included.

Buy Your Product Key Now →

Buy Microsoft Office 2021 Professional Plus — Genuine Software Keys at the Best Price in USA & Canada

MMKeys.com is your trusted source for genuine Microsoft software keys across the USA and Canada. Microsoft Office 2021 Professional Plus is the most complete edition of the Office 2021 suite — including Word, Excel, PowerPoint, Outlook, OneNote, Access, Publisher and Skype for Business — with a lifetime license for Windows or Mac. No subscription, no recurring fees, just genuine software at the best price.


All our Microsoft software product keys are 100% authentic and activate directly on Microsoft's official servers. Buy your cheap Microsoft Office 2021 Professional Plus key today and receive your digital activation code instantly by email. Every purchase includes a full lifetime warranty and money-back guarantee — making MMKeys the most trusted source for discounted Microsoft software keys in North America.

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