Office 2021 Pro Plus in 2026: Is It Still Worth Buying After End of Support?

Office 2021 Pro Plus keys are easy to find and cheap to buy. You can get Word, Excel, PowerPoint, Outlook, Access and Publisher for a one-time payment, with no subscription. What most listings leave out is that Microsoft stopped supporting Office 2021 on 13 October 2026.

That doesn’t make it useless. It does change who should buy it. This guide covers what Office 2021 Pro Plus includes, what end of support really means for you, how it compares with Office 2024 and Microsoft 365, and how to install and activate it properly.

What is Office 2021 Pro Plus?

Office 2021 Pro Plus, officially Office LTSC Professional Plus 2021, is the most complete edition of Office 2021. Microsoft released it in September 2021 for businesses buying through volume licensing, which is why you won’t find it on Microsoft’s consumer store. It reaches individual buyers through licence resellers.

It’s a perpetual licence: you pay once and keep using that version. It runs on Windows only. Mac users need a different edition.

A note on Publisher: Microsoft retired Publisher in October 2026. It still opens in Office 2021, but there will be no more fixes, and newer Office versions don’t include it. If you depend on Publisher files, save them as PDF or rebuild them in Word now, so you’re not stuck later.

Office 2021 end of support: what changed on 13 October 2026

Microsoft gave Office 2021 five years of support under its fixed lifecycle policy. According to the Office LTSC 2021 lifecycle page, that period ended on 13 October 2026.

The real risk is email attachments. Most attacks on Office arrive as a Word or Excel file that exploits a flaw in the app. When a new flaw is found from now on, Microsoft 365 and Office 2024 get a fix, and Office 2021 doesn’t. The longer you use it, the more of those unfixed flaws build up.

Microsoft’s own advice is to move to Microsoft 365 or, for PCs that must stay offline, to Office LTSC 2024.

Is Office 2021 Pro Plus still worth buying in 2026?

For some people, yes. It comes down to where your files come from and what’s at stake if something goes wrong.

Two real-world examples

• Ravi, a retired teacher, writes letters and keeps a household budget in Excel on a PC he rarely uses for email. Office 2021 Pro Plus costs him a fraction of a subscription and does everything he needs. Good fit.
• A six-person accountancy practice sends and receives client spreadsheets all day through Outlook. One malicious attachment could expose every client’s data. They should choose Office 2024 Pro Plus or Microsoft 365.

Office 2021 vs Office 2024 vs Microsoft 365

Microsoft 365 Personal price from Microsoft’s US store. For comparison, Microsoft sells the closest one-time retail editions, Office Home 2024 and Home & Business 2024, at $179.99 and $249.99. Prices checked October 2026.

If you want to pay once and keep your PC supported for years, Office 2024 Professional Plus is the natural step up. If you want AI tools, cloud storage and a Mac version, Microsoft 365 is the better fit, at a yearly cost.

What’s new in Office 2021 Pro Plus (features that matter)

Office 2021 was a big step up from Office 2019, especially in Excel. These are the features you’ll actually use.

Excel: XLOOKUP, dynamic arrays and LET

XLOOKUP replaces VLOOKUP. It searches in any direction, doesn’t break when you insert a column, and lets you set your own “not found” message. Here’s a stock list where a code typed in D2 pulls the right price into E2:

Excel 2021 also adds dynamic arrays (one formula fills a whole range, with functions like FILTER, SORT and UNIQUE), LET for naming parts of a long formula, and XMATCH.

Word, PowerPoint and Outlook

• Word: dark mode for the page itself, Line Focus for distraction-free reading, and a built-in Translator.
• PowerPoint: record a presentation with your webcam video and ink, and sketched-style shapes.
• Outlook: faster instant search and one-click message translation.
• Everywhere: a library of free stock images and icons, OpenDocument (ODF 1.3) support, and real-time co-authoring on files saved to OneDrive or SharePoint.

What it doesn’t have: Copilot or any AI writing or design tools. Those are Microsoft 365 features. Office 2021 also won’t get new features, since it’s a fixed release. If a seller describes Office 2021 as “AI-powered,” they’re wrong.

Office 2021 Pro Plus system requirements in 2026

• Display: 1280 × 768 or higher. 4K screens need the 64-bit version.
• 64-bit or 32-bit: choose 64-bit unless you rely on an old add-in that only works in 32-bit.
• Internet: needed to download, install and activate. Daily use works offline.
• Windows 10 note: Windows 10 itself is past its main support date, so a PC still on it has two unsupported layers. If you’re setting up a PC for years of use, Windows 11 plus Office 2024 is the safer pairing.

Office 2021 Pro Plus licence types explained

Search for an Office 2021 Pro Plus key and you’ll find prices from a few dollars upwards, and the keys aren’t all the same. Here’s what’s actually on sale.

What about “3-device” keys? Unless the seller clearly says otherwise, one Office 2021 Pro Plus key activates one PC. A key advertised for several devices is usually either a volume key with spare activations, which can run out, or a misleading listing.

Buying for a business in India? Ask for a GST invoice

A GST-registered business can claim input tax credit only with a proper GST invoice from a GST-registered seller. Check the seller’s GSTIN on the invoice. Sellers based outside India usually can’t issue one, so ask before you buy if the credit matters.

What you get when you buy from us

How to install and activate Office 2021 Pro Plus

Your key type decides the route. Retail-bind keys install from your Microsoft account; volume (MAK) keys install with Microsoft’s Office Deployment Tool. Trying a volume key at office.com is the most common reason people think their key “doesn’t work.”

Before you start: remove older Office

Uninstall any older Office version and any Microsoft 365 trial that came with the PC: open Settings > Apps > Installed apps, find Microsoft Office or Microsoft 365, and uninstall. Restart afterwards. Leftover trials are the main cause of install errors.

Route 1: Retail-bind key

1. 1

   Redeem your key

   Go to setup.office.com, sign in with your Microsoft account (or create one), and enter the 25-character key.

2. 2

   Download Office

   Open your Microsoft account’s Services & subscriptions page, find Office Professional Plus 2021 and select Install.

3. 3

   Run the installer

   Open the downloaded file and wait for “You’re all set.” It usually takes 5 to 15 minutes.

4. 4

   Confirm activation

   Open Word, select File > Account, and check it says Product Activated.

Route 2: Volume (MAK) key with the Office Deployment Tool

1. 1

   Download the Office Deployment Tool

   Get it free from the Microsoft Download Center, run it, and extract it to a new folder such as C:\ODT.

2. 2

   Create configuration.xml

   In that folder, create a text file called configuration.xml and paste the settings below, with your key in place of the Xs.

3. 3

   Run the installer

   Press Win + X, then A to open Terminal (Admin). Go to the folder and run the setup command.

4. 4

   Confirm activation

   Open Word, select File > Account, and check it says Product Activated.

<Configuration>
  <Add OfficeClientEdition="64" Channel="PerpetualVL2021">
    <Product ID="ProPlus2021Volume" PIDKEY="XXXXX-XXXXX-XXXXX-XXXXX-XXXXX">
      <Language ID="en-us" />
      <ExcludeApp ID="Teams" />
    </Product>
  </Add>
  <RemoveMSI />
  <Display Level="Full" AcceptEULA="TRUE" />
</Configuration>

Check activation in any Office app

Common install and activation problems

Still using Office 2021? How to stay safer

If Office 2021 is right for you, a few settings close the most common attack routes. Open any Office app, then go to File > Options > Trust Center > Trust Center Settings.

• Keep Windows fully updated. Windows security patches still block some attacks that target Office.
• Run a reputable antivirus. It catches many malicious documents before they open.
• Be wary of unexpected attachments. Preview them in your browser or email app before opening in Office.
• Set an upgrade date. Plan to move to Office 2024 or Microsoft 365 when your needs change, and convert any Publisher files now.

Office 2021 Pro Plus or Office 2024 Pro Plus: which should you buy?

Frequently asked questions

The bottom line

Office 2021 Pro Plus still does everything it did last month, and it’s still the cheapest way to get the full Office desktop suite. It just won’t receive another security fix. For an offline PC or personal documents, that’s an easy trade for the price. For anyone emailing files to clients, Office 2024 Pro Plus buys three more years of protection.

Not sure which suits you? Check our FAQ or contact our support team, and we’ll help you choose before you buy.