Microsoft Office 2021 Professional Plus – 5 PC/User is the ideal solution for small businesses, teams, and multi-device households who need Microsoft’s most complete Office 2021 desktop suite running across up to five Windows PCs — all covered under a single product key. You receive one licence key that can be redeemed at setup.office.com and activated on up to 5 devices, giving every user permanent access to Word, Excel, PowerPoint, Outlook, OneNote, Publisher, Access, and Microsoft Teams, with no subscription and no recurring fees.

Your product key is delivered by email within 1–2 minutes of purchase. Activation is completed via Microsoft’s official online portal at setup.office.com, and the licence binds to the Microsoft account used during redemption for easy recovery and reinstallation across all five devices.

⚠️ Important Licence Note: This listing provides 1 product key that activates Office 2021 Professional Plus on up to 5 Windows PCs. Activation is completed online at setup.office.com — a Microsoft account is required. This product is for Windows only — it is not compatible with macOS.

Why Choose the Office 2021 Pro Plus 5 PC/User Key?

The Office 2021 Pro Plus 5 PC/User licence is significantly more cost-effective than purchasing five individual single-device keys separately. With a single key managing up to five activations under one Microsoft account, it also simplifies licence management for the account holder. It is designed for:

• Small businesses and teams equipping multiple workstations with a consistent, fully licensed Office suite — without the overhead of a per-seat subscription model.
• IT administrators and office managers who want to deploy Office across up to five managed PCs under one centralised Microsoft account, making reinstallations and device management straightforward.
• Families or home offices with multiple PCs — desktop, laptop, and home workstations — all needing Office covered under one purchase and one account.
• Freelancers and consultants who use Office across a desktop, a laptop, and additional machines and want all devices covered from a single activation key.
• B2B buyers and resellers looking for volume Office 2021 Pro Plus coverage. For larger volumes, visit our B2B & Wholesale enquiry page or explore our enterprise licensing options.

Need to cover even more devices? See our Office 2021 Pro Plus LTSC 50 PC option for larger deployments.

Applications Included in Office 2021 Professional Plus

Every one of the five activated devices gets the complete Office 2021 Professional Plus suite — Microsoft’s most comprehensive perpetual Office edition for Windows:

• Word 2021 — Write and collaborate on professional documents with enhanced co-authoring, improved grammar and style tools, better accessibility features, and a faster, cleaner interface.
• Excel 2021 — Advanced data analysis with powerful new functions including XLOOKUP, XMATCH, LET, FILTER, SORT, UNIQUE, and RANDARRAY, plus full dynamic array support and improved chart rendering.
• PowerPoint 2021 — Build compelling presentations with new Morph transitions, improved Cameo (live camera slides), enhanced recording tools, and smarter designer suggestions.
• Outlook 2021 — Professional email, calendar, task, and contact management with improved search, better conversation threading, and enhanced Exchange and Microsoft 365 compatibility.
• OneNote 2021 — Capture, organise, and search notes, diagrams, and media in a flexible digital notebook with OneDrive cloud sync.
• Publisher 2021 — Design brochures, newsletters, flyers, and marketing materials with professional desktop publishing tools — exclusive to the Professional Plus edition.
• Access 2021 — Build and manage relational databases for business data entry, reporting, and analysis — also exclusive to Professional Plus.
• Microsoft Teams — Chat, video conferencing, and file sharing, integrated with the Office 2021 suite for seamless team collaboration.

Publisher and Access are not available in any other Office 2021 edition for Windows. If your team does not require these applications, the more affordable Office 2021 Home and Business for PC may be a better fit.

Key Features and Benefits

• 1 Key, Up to 5 Activations — A single genuine product key redeemed at setup.office.com, covering up to five Windows PC activations under one Microsoft account.
• Online Activation via setup.office.com — Redeem your key through Microsoft’s official portal and install Office directly from Microsoft’s servers on each of your five devices.
• Microsoft Account Linked — The licence binds to the Microsoft account used during redemption, providing secure recovery and easy reinstallation on any of the five covered devices if needed.
• Permanent Perpetual Licence — A lifetime, one-time purchase. No subscription fees, no auto-renewals, no annual charges — ever.
• Complete Office 2021 Suite on Every Device — All five devices gain the full Professional Plus application set: Word, Excel, PowerPoint, Outlook, OneNote, Publisher, Access, and Teams.
• Commercial Use Rights Included — The licence covers professional and business use across all five devices, making it fully compliant for commercial environments.
• Genuine Microsoft Licence — Every key sold at WinCDKey is a 100% authentic Microsoft product key. Verify our Microsoft Partner status here.
• Windows 10 & Windows 11 Compatible — Fully compatible with both Windows 10 and Windows 11, including 32-bit and 64-bit editions, across all five activations.
• New Excel Functions on Every PC — XLOOKUP, dynamic arrays, LET, and all other Excel 2021 improvements are available on every activated device — a major upgrade over Office 2019 and 2016.
• Full Dark Mode Support — Dark mode across the entire Office 2021 suite on all five devices.
• Real-Time Co-Authoring — Users across all five devices can collaborate simultaneously on shared Word, Excel, and PowerPoint files via OneDrive or SharePoint.
• Works Fully Offline After Activation — All Office 2021 applications run without an internet connection once installed and activated on each device.
• Instant Digital Delivery — Your product key is delivered by email within 1–2 minutes of checkout, 24/7.

How the 5 PC/User Licence Works — Key Details

Understanding exactly what you are buying is essential. Here is a clear breakdown of how this licence operates:

• You receive 1 product key — a single 25-character Microsoft product key delivered to your email within 1–2 minutes of purchase.
• 1 key, up to 5 device activations — the key is redeemed once at setup.office.com using a Microsoft account. From there, Office 2021 Pro Plus can be downloaded and installed on up to 5 Windows PCs signed into or authorised through that same Microsoft account.
• Microsoft account required — the key must be redeemed at setup.office.com. The licence is linked to the Microsoft account used during redemption, which manages which devices are activated.
• Each activated device gets the full suite — every PC that installs Office under this licence has access to all eight applications: Word, Excel, PowerPoint, Outlook, OneNote, Publisher, Access, and Teams.
• Manage activations through your Microsoft account — you can view and manage which devices are activated by signing into your Microsoft account at account.microsoft.com/services.
• Windows only — all five activations are for Windows PCs exclusively. This licence does not cover macOS devices.

Product Details at a Glance

• Product: Microsoft Office 2021 Professional Plus
• Number of Keys Provided: 1 product key
• Devices Covered: Up to 5 Windows PCs
• Licence Type: Perpetual (lifetime, one-time purchase)
• Activation Method: Online via setup.office.com (Microsoft account required)
• Platform: Windows only (does NOT work on Mac)
• Compatible OS: Windows 10, Windows 11 (32-bit & 64-bit)
• Commercial Use Rights: Yes
• Region: Global
• Languages: Multilingual
• Microsoft Support Until: October 2026
• Delivery: 1 product key by email within 1–2 minutes of purchase
• Support: Live chat and email, lifetime activation support

System Requirements — Office 2021 Professional Plus

Each of the five PCs being activated must meet the following minimum requirements:

• Operating System: Windows 10 or Windows 11 (64-bit recommended)
• Processor: 1.1 GHz dual-core processor or faster
• RAM: 4 GB minimum (8 GB recommended for best performance)
• Storage: 4 GB available disk space per installation
• Display: 1280 x 768 screen resolution minimum
• Graphics: DirectX 9 or later with WDDM 2.0 or higher for hardware acceleration
• Internet: Required for download and activation at setup.office.com; not required for everyday use after activation
• Microsoft Account: Required — the key is redeemed and managed through setup.office.com

Note: This product is for Windows PCs only. For Mac users, please see our Office 2021 for Mac range.

How to Redeem and Activate Office 2021 Pro Plus (5 PC/User Key)

1. Purchase and receive your key — Your single product key will be delivered to your email within 1–2 minutes of confirmed payment.
2. Go to setup.office.com — On any of your five PCs, open a browser and visit setup.office.com.
3. Sign in to your Microsoft account — Log in with an existing Microsoft account or create a free one. This is the account the licence will bind to and through which all five device activations will be managed.
4. Enter your product key — Input your 25-character product key exactly as shown in your order email and click Next to redeem it.
5. Download and install Office 2021 on the first PC — Follow the on-screen prompts to download and install Office 2021 Pro Plus on the current device.
6. Install on additional PCs — On each of your remaining devices, sign into setup.office.com with the same Microsoft account. The licence will already be associated with the account — simply click Install to download and install Office on each additional PC, up to a total of five devices.
7. Activation complete on all devices — Each device with Office installed and signed in under the associated Microsoft account will be fully and permanently activated.

For detailed guidance, see our full Installation & Activation Guide or contact our team via the Help & Support Centre.

Compare Office 2021 Pro Plus Multi-Device Options at WinCDKey

Looking to deploy the latest version? See our Office 2024 Professional Plus for 3 Devices as an upgrade option with extended Microsoft support through 2029.

Why Buy from WinCDKey?

• ⚡ Instant Key Delivery — Your product key is emailed within 1–2 minutes of confirmed payment, every day of the year including weekends and public holidays.
• ✅ Official Microsoft Partner — Verified Microsoft Partner. Confirm our partner profile here.
• 🛡️ Lifetime Activation Support — Any activation issues across your five devices? Our team resolves them at no extra cost, for the lifetime of your licence.
• 💳 One-Time Payment, No Subscriptions — Pay once for all five device activations. No recurring fees, no subscription management, no per-seat charges.
• 🏢 B2B & Wholesale Available — Need more coverage? Request wholesale pricing or explore enterprise licensing.
• 🔒 Secure Checkout — Fully encrypted transactions for complete payment security.
• ⭐ Trusted by 200,000+ Customers — Read verified reviews on our Trustpilot page.

You Might Also Be Interested In

• Office 2021 Pro Plus – 1 PC (Retail Online) — The single-device retail version activated via setup.office.com.
• Office 2021 Pro Plus LTSC – 3 Device — A 3-device option for smaller teams.
• Office 2021 Pro Plus LTSC – 50 PC — For large-scale deployments or enterprise use.
• Office 2024 Professional Plus – 3 Devices — Upgrade to the latest version with support until 2029.
• Office 2024 Professional Plus – 1 PC — The latest single-device Pro Plus edition.
• Office 2021 Pro Plus + Windows 11 Pro Bundle — Cover both Office and your OS in one deal.
• Windows 10/11 Pro + Office 2021 Pro Plus Bundle — OS and Office together at a bundled price.
• Office 2021 Home and Business for PC — A lighter, lower-cost alternative without Access and Publisher.
• Browse all Office 2021 products at WinCDKey — View every edition and variant in the Office 2021 range.

Frequently Asked Questions

Do I receive 5 separate keys or 1 key for 5 devices?

You receive 1 single product key. That one key is redeemed at setup.office.com and covers up to 5 Windows PC activations under the Microsoft account used during redemption.

How do I install Office on all 5 PCs with one key?

Redeem your key at setup.office.com on any one of your devices using your Microsoft account. Once redeemed, the licence is associated with that account. On each of your remaining devices, simply sign into setup.office.com with the same Microsoft account and click Install — the licence is already linked and ready to deploy, up to a maximum of five devices.

Is a Microsoft account required?

Yes. Because activation is handled through setup.office.com, a Microsoft account is required to redeem and manage the licence. The account you use during redemption is the account that controls which five devices are activated. If you need activation without a Microsoft account, please see our Office 2021 Pro Plus LTSC (phone activation) option instead.

Can I use this on more than 5 PCs?

No. The licence covers a maximum of five Windows PC activations. If you need to cover more devices, see our Office 2021 Pro Plus LTSC 50 PC option or request a wholesale quote for volume pricing.

Can I replace one of the five activated PCs if a machine is retired?

Yes. Because the licence is managed through your Microsoft account, you can deactivate an old device via account.microsoft.com/services and then install Office on a replacement PC using the same account, provided the total number of active devices does not exceed five at any one time.

Does every PC get the full Office 2021 Pro Plus suite?

Yes. All five devices activated under this licence receive the complete Office 2021 Professional Plus application set — Word, Excel, PowerPoint, Outlook, OneNote, Publisher, Access, and Microsoft Teams.

Is this suitable for business use?

Yes. This licence includes full commercial use rights across all five devices, making it appropriate for professional and business environments. For larger requirements, visit our enterprise licensing page.

Does this work on Mac?

No. This licence is for Windows 10 and Windows 11 PCs only. For Mac deployments, please see our Office 2021 for Mac range.

Is Office 2021 still receiving Microsoft support?

Yes. Microsoft provides security and stability updates for Office 2021 Professional Plus through October 2026. For extended support through October 2029 with the latest features, consider upgrading to Office 2024 Professional Plus.

What is your refund policy?

Once the product key has been redeemed or an activation attempt has been made, the purchase becomes non-refundable as the key has been consumed. In exceptional cases, we can credit your WinCDKey wallet. Please review our full Refunds & Returns Policy before purchasing.