Office 2021 Pro Plus: Deals, Install & Activation Guide

Office 2021 Pro Plus is Microsoft’s most complete standalone productivity suite, packed with Word, Excel, PowerPoint, Outlook, Teams, OneNote, Access, and Publisher — and it’s available right now at Shop Key Online for as little as €28.95. Whether you need a one-time-activation retail key or a bind-to-account key that ties permanently to your Microsoft account, this guide covers every deal we stock and walks you through installation and activation from start to finish.

What Is Office 2021 Pro Plus?

Office 2021 Professional Plus is the perpetual (one-time purchase) edition of Microsoft Office aimed at power users and businesses. Released in October 2021 alongside Windows 11, it includes the full desktop app suite and receives mainstream support from Microsoft until October 2026. Unlike a Microsoft 365 subscription, you pay once and own it — no recurring fees, no cloud dependency.

• Apps included: Word, Excel, PowerPoint, Outlook, OneNote, Publisher, Access, Teams

• Platform: Windows only (for Mac, see Office 2021 Home & Business)

• Licence type: Perpetual — one PC, forever

• Support end date: October 2026 (mainstream) / October 2026 (extended)

Office 2021 Pro Plus Deals at Shop Key Online

Shop Key Online stocks two distinct Office 2021 licence types, each suiting a different use case and budget. All keys are delivered instantly to your inbox — usually within minutes of purchase.

Retail Key — One-Time Activation (€28.95)

The Microsoft Office 2021 Pro Plus Retail Key at €28.95 is our most popular pick and the lowest-cost route to the full Pro Plus app set. It is a one-time activation licence: once the key has been used to activate Office on a PC, that activation is permanent for that installation. The key itself is spent at that point, so if you later rebuild your PC or move to a new machine, you will need a fresh key. It comes with an official Microsoft download link so you always install from a clean, genuine source.

Bind-to-Account Key — Cloud Backup (€66.55)

The Office 2021 Pro Plus Bind-to-Account Key at €66.55 links your licence directly to a Microsoft account rather than to a single installation. This means your Office licence travels with your Microsoft account — you can re-download and re-activate on a new PC simply by signing in, with no key re-entry required. It’s the premium option for users who frequently rebuild or upgrade their machines.

Bundle Deals — Office + Windows Together

If you also need a Windows licence, our bundles offer the best combined savings:

• Windows 10 Pro + Office 2021 Pro Plus Retail Bundle — €33.90 (regular €43.90)

• Windows 11 Home + Office 2021 Pro Plus Retail Bundle — €34.60 (regular €44.60)

• Windows 11 Pro + Office 2021 Pro Plus Retail Bundle — €36.90 (regular €46.90)

Retail vs Bind-to-Account: Which Office 2021 Licence Key Is Right for You?

Choosing the right licence type is straightforward once you know the key difference.

• Retail Key: One-time activation, permanent on the PC you activate it on. Best for home users and small businesses installing Office on a machine they intend to keep.

• Bind-to-Account Key: Tied to your Microsoft account, not the installation. Best for power users who rebuild PCs or want the simplest re-activation experience.

How to Download and Install Office 2021 Pro Plus

Installing Office 2021 Professional Plus takes just a few minutes. Follow these steps after you receive your key by email.

1. Open the download link included in your Shop Key Online order email. This directs you to the official Microsoft Office portal.

2. Sign in or create a Microsoft account at setup.office.com (required for both licence types to download the installer).

3. Click Install Office to download the OfficeSetup.exe installer (approximately 7 MB — the full suite downloads in the background during install).

4. Run the installer and click Yes on the UAC prompt. Installation completes automatically — no additional options to configure.

5. Wait for completion — a “You’re all set! Office is installed now” screen confirms the suite is ready.

How to Activate Your Office 2021 Licence Key

Activation differs slightly depending on whether you purchased a retail key or a bind-to-account key. Both methods are quick and use official Microsoft channels.

Activating a Retail Office 2021 Key

1. Open any Office app (e.g. Word) after installation completes.

2. You will see the Microsoft Office Activation Wizard — click Enter a product key instead.

3. Type your 25-character product key from the Shop Key Online email and click Continue.

4. Office connects to Microsoft’s activation servers and confirms your licence within seconds.

5. Click Start using Word (or whichever app you opened) — activation is complete and permanent on that PC.

Alternatively, go to File → Account → Activate Product inside any Office app at any time to trigger activation manually.

Activating a Bind-to-Account Office 2021 Key

A bind-to-account key works differently — it attaches the Office 2021 Professional Plus licence to your Microsoft account rather than to the installation directly.

1. Visit setup.office.com and sign in to your Microsoft account.

2. Click Enter a product key and type the 25-character key from your email.

3. Click Next — Microsoft will validate and bind the licence to your account. You’ll see a confirmation screen.

4. Click Install Office to download and install directly from your account — the licence is already attached, so no further key entry is needed during installation.

5. On future PCs, simply sign in at setup.office.com with the same Microsoft account and re-install — your licence is remembered automatically.

System Requirements for Office 2021 Pro Plus

Before installing, confirm your PC meets Microsoft’s minimum specifications:

• OS: Windows 10 or Windows 11 (32-bit or 64-bit)

• Processor: 1.6 GHz, dual-core

• RAM: 4 GB (64-bit); 2 GB (32-bit)

• Storage: 4 GB available disk space

• Display: 1280 × 768 resolution

• Internet: Required for download and initial activation only

For the full official specification list, refer to Microsoft’s Office installation guide.

Troubleshooting Common Activation Issues

Most activation problems resolve quickly with one of the following fixes.

• Invalid product key error: Double-check the key for look-alike characters (0 vs O, 1 vs I). If it still fails, contact Shop Key Online support — all keys are covered by a 100% money-back guarantee.

• Key already used / activation limit reached: A retail Office 2021 key is a one-time activation and cannot be re-used on a second installation. If you are setting up a new PC, you will need a new key. If you want a licence you can move between machines, choose the bind-to-account option instead.

• Office keeps asking to activate: Ensure your Windows clock and date are correct — a skewed system clock can cause Microsoft’s servers to reject the activation handshake.

• Bind-to-account key not showing in Microsoft account: Allow up to 10 minutes after key entry for the licence to appear under Services & Subscriptions at account.microsoft.com.

Frequently Asked Questions

What is the difference between an Office 2021 Pro Plus retail key and a bind-to-account key?

A retail Office 2021 key is a one-time activation: you enter it once, Office activates permanently on that PC, and the key is then spent. A bind-to-account key attaches the licence to your Microsoft account instead, so you can re-install and re-activate on a different PC just by signing in — no key needed the second time. Retail costs considerably less; bind-to-account costs more but survives a hardware change.

Is an Office 2021 retail key transferable to a new PC?

No. Unlike Windows, an Office 2021 Professional Plus retail key is a single, one-time activation and cannot be moved to another machine afterwards. If you expect to rebuild or replace your PC, the bind-to-account key is the licence type designed for that.

Can I install Office 2021 Professional Plus on more than one PC?

No — all single-licence Office 2021 Professional Plus keys (retail and bind-to-account) cover one PC at a time. If you need Office on multiple machines, you will need a separate licence for each device.

What happens if I lose my Office 2021 licence key?

Once a retail key has been activated, Office stays activated on that PC — you don’t need the key again for normal use. For bind-to-account licences the key is never needed again after the initial redemption; simply sign in at setup.office.com to re-install. Either way, keep the original Shop Key Online order confirmation email as a safe backup.

Is Office 2021 Pro Plus a one-time purchase or a subscription?

It is a one-time, perpetual purchase — you pay once and use it indefinitely. There are no monthly or annual renewal fees. Microsoft provides security and quality updates through October 2026 at no extra cost.

Does Office 2021 include Microsoft Teams?

Yes. Office 2021 Pro Plus includes Microsoft Teams as part of the suite. However, Teams is also available as a standalone free download, so if you only need Teams you don’t need the full Office suite.

Can I upgrade from Office 2021 to Microsoft 365 later?

Yes. Owning an Office 2021 licence doesn’t prevent you from subscribing to Microsoft 365 in the future. The two are independent — you can run either or switch at any time without losing your existing files or settings.