Download Microsoft Office 2021 Professional Plus – Free Official ISO

This page provides the official Microsoft Office 2021 Professional Plus free download directly from Microsoft’s servers, along with a complete guide covering all key features, system requirements, installation steps, and where to get a genuine Office 2021 Pro Plus licence key at the best price.

Microsoft Office 2021 Professional Plus is the most complete perpetual-licence edition of Microsoft Office — a one-time purchase that includes Word, Excel, PowerPoint, Outlook, OneNote, Teams, Publisher, and Access, with no monthly subscription fees. Released in October 2021, it delivers the features that were added to Microsoft 365 between 2019 and 2021, including XLOOKUP, real-time co-authoring, dark mode, and Microsoft Teams.

⬇ Download Office 2021 Pro Plus ISO (Official) 🔑 Buy Office 2021 Pro Plus Key

Microsoft Office 2021 Pro Plus – What’s New

Office 2021 Professional Plus is a substantial upgrade over Office 2019. Here is every major feature addition, broken down by application:

Excel 2021 – New Features

• XLOOKUP — the modern replacement for VLOOKUP and HLOOKUP, supporting reverse search, exact match, and built-in error handling
• XMATCH — a more powerful replacement for MATCH with support for reverse search and binary search modes
• LET function — assign names to calculation results within a formula to improve readability and performance
• Dynamic Arrays — formulas that automatically spill results into adjacent cells (SORT, FILTER, UNIQUE, SEQUENCE functions)
• LAMBDA function — create custom reusable functions in Excel without VBA
• Real-time co-authoring — multiple users can edit the same Excel workbook simultaneously with live cursor visibility

Word 2021 – New Features

• Real-time co-authoring — see your colleagues’ cursors and edits in real time as you work on the same document
• Dark Mode — fully dark UI across the entire Word interface for comfortable long-session working
• Enhanced Find & Replace — improved search with better pattern matching and accessibility
• Improved Accessibility Checker — more detailed accessibility recommendations aligned with WCAG 2.1 guidelines

PowerPoint 2021 – New Features

• Real-time co-authoring — collaborate live with teammates on the same presentation
• Record with Teleprompter — display speaker notes while recording a presentation video
• Dark Mode — full dark theme support across all views
• Improved stock media library — expanded built-in library of royalty-free images, icons, and videos

Outlook 2021 – New Features

• Search improvements — faster, more relevant search results across emails, contacts, and calendar events
• Dark Mode — complete dark theme including email reading and compose views
• Improved calendar sharing — share calendars with richer permission controls

Microsoft Teams – Now Included

For the first time in a perpetual Office edition, Microsoft Teams is bundled with Office 2021 Professional Plus. Teams provides chat, video calling, file sharing, and integrated meeting scheduling directly within the Office ecosystem.

Microsoft Office 2021 Professional Plus – System Requirements

How to Download & Install Office 2021 Professional Plus

Step 1: Download the Official ISO

Click the button below to download the official ProPlus2021Retail.img file directly from Microsoft’s CDN. The file is approximately 3.5–4 GB. No torrent, no third-party site — pure Microsoft.

⬇ Download ProPlus2021Retail.img (English)

For other languages, visit our Office 2021 full download guide which includes ISO links for 20+ languages.

Step 2: Mount the .img File

Right-click the downloaded file and select Mount. Windows 10 and 11 can natively mount .img files. If your version doesn’t recognise it, rename the extension to .iso — the content is identical.

Step 3: Run Setup.exe

Open the mounted virtual drive in File Explorer. Double-click Setup.exe and accept the UAC prompt. The installer will launch and download any remaining components automatically.

Step 4: Activate with Your Product Key

After installation completes, open Word or Excel. Go to File → Account → Activate Product and enter your 25-character key. Activation happens in seconds. If you don’t have a key yet, buy one from Softkeyworld for instant email delivery.

Buy a Genuine Office 2021 Professional Plus Key

Softkeyworld is a UK-registered software licence retailer supplying authentic Microsoft Office 2021 keys at up to 79% off the Microsoft Store retail price. All keys are genuine, activate through Microsoft’s servers, and come with instant email delivery and a 7-day refund policy.

🔑 Buy Office 2021 Pro Plus – from $28.99

Frequently Asked Questions

Q1: Is the Microsoft Office 2021 Professional Plus download safe?

Yes — the download link on this page points directly to officecdn.microsoft.com, Microsoft’s official server. It is the identical file used by Microsoft’s own delivery system and has not been modified in any way.

Q2: What is the build number for Office 2021 Pro Plus?

The original RTM build of Office 2021 Professional Plus is Version 2108 (Build 14332.20198). After installation, Windows Update will automatically apply the latest cumulative patches bringing it up to the current build.

Q3: Can I download Office 2021 Pro Plus in 32-bit?

Yes — Office 2021 is available in both 32-bit and 64-bit. The ISO linked above is 64-bit (recommended for all modern PCs). For 32-bit, use the Office Deployment Tool and specify OfficeClientEdition=32 in your configuration XML.

Q4: How is Office 2021 Pro Plus different from Microsoft 365?

Office 2021 Pro Plus is a one-time purchase with a fixed feature set and security-only updates until October 2026. Microsoft 365 is a monthly/annual subscription that receives continuous new features, includes 1 TB OneDrive storage, and can be installed on multiple devices. Office 2021 is ideal for users who want perpetual ownership; Microsoft 365 suits those who want the latest features and cloud collaboration tools.

Q5: How long is Office 2021 Pro Plus supported?

Microsoft Office 2021 mainstream support runs until October 2026, with extended support (security patches only) until October 2026. After that, the software continues to function but no longer receives updates from Microsoft.

Related Products & Guides

• Microsoft Office 2024 Pro Plus – $69.99
• Microsoft Office 2019 Pro Plus – $91.80
• Microsoft 365 Family – 1 Year
• Office 2021 Download & Activation Guide (All Languages)
• Office 2021 Direct Download – All Editions
• Microsoft Office 2019 Free Download Guide

The ISO download link on this page points directly to Microsoft’s official Content Delivery Network. Softkeyworld supplies genuine Microsoft Office licence keys through authorised retail channels with instant email delivery and a 7-day refund policy. Registered in England and Wales, Company No. 13321373.