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Microsoft Office 2021 Key — Professional Plus

Office 2021 Pro Plus — genuine lifetime key, $6.90

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Office 2021 Professional Plus $6.90
  • Word · Excel · PowerPoint · OneNote
  • Outlook for email + Access for databases
  • Genuine key, activates straight with Microsoft
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  • Genuine Microsoft Office 2021 Professional Plus licence
  • Word, Excel, PowerPoint, OneNote, Outlook and Access
  • One-time purchase — no monthly subscription
  • Lifetime licence, activates directly with Microsoft
  • Runs on Windows 10 and Windows 11

Short answer: Office 2021 Professional Plus at RebootDoctor is a genuine one-time-purchase Microsoft key for $6.90 — Word, Excel, PowerPoint, OneNote, Outlook and Access on Windows 10 or 11, with no subscription. It's the first one-time-purchase Office with XLOOKUP and dynamic arrays. Note the date: under Microsoft's Modern Lifecycle Policy, Office 2021's support ends on October 13, 2026. If you need security updates beyond that, Office 2024 (supported until October 9, 2029) is the better buy.

What Office 2021 Added Over 2019

Office 2021 was released on October 5, 2021. The headline changes are in Excel:

  • XLOOKUP and XMATCH, which replace VLOOKUP / HLOOKUP / INDEX-MATCH for most lookups and can search in any direction.
  • Dynamic arrays — FILTER, SORT, SORTBY, UNIQUE, SEQUENCE and RANDARRAY — where one formula “spills” its results into as many cells as needed.
  • The LET function, for naming intermediate results inside a formula.

Beyond Excel, Office 2021 brought real-time co-authoring for files stored in OneDrive or SharePoint, a dark mode for the Word page itself (not just the ribbon), a refreshed visual style, and support for OpenDocument Format (ODF) 1.3.

A Different Lifecycle From 2019 and Earlier

Office 2010–2019 followed Microsoft’s Fixed Lifecycle Policy (mainstream plus extended support). Office 2021 follows the Modern Lifecycle Policy: five years of support with no extended phase. Security updates for Office 2021: until October 13, 2026 (end of support). After that date the apps keep working but receive no further security fixes — the same position Office 2019 has been in since October 2025.

Who It’s For

  • You want XLOOKUP and dynamic arrays for less than Office 2024 costs, and accept that security updates end on October 13, 2026.
  • You’re reinstalling a PC that already ran 2021 and want the same version back.
  • You want the longest support from a one-time purchase? Choose Office 2024 — its support runs to October 9, 2029. The comparison table below lays the dates out side by side.

It runs on Windows 10 and Windows 11, and it’s the Professional Plus edition, so Outlook and Access are included.

Not sure whether 2021 or 2024 fits your setup? Tell us what you run and what you use Office for, and we'll tell you which key to buy before you pay.

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Office 2010–2024 compared

Every Office key we sell, side by side. Prices are ours; support dates are the ones Microsoft publishes.

Microsoft Office versions sold by RebootDoctor — editions, prices, end of Microsoft security updates and Windows compatibility
Version Edition(s) we sell Price Microsoft security updates Windows 11 Oldest Windows Best for
Office 2024 Released 2024 Office Home 2024Professional Plus $5.50$6.99 Supported Windows 10 Anyone who wants security updates until 2029. Home covers Word, Excel, PowerPoint and OneNote; Pro Plus adds Outlook and Access.
Office 2021 Released 2021 · this page Office 2021 Professional Plus $6.90 Supported Windows 10 XLOOKUP and dynamic arrays at a lower price. Microsoft support end date: October 13, 2026.
Office 2019 Released 2018 Office 2019 Professional Plus $6.76 Supported until Oct 2025 Windows 10 Windows 10/11 users who want the 2019 Excel functions (IFS, TEXTJOIN) and can live without security updates.
Office 2016 Released 2015 Office 2016 Professional Plus $6.58 Supported until Oct 2025 Windows 7 SP1 Older, low-spec PCs — and the newest version that still installs on Windows 7 SP1 and 8.1.
Office 2013 Released 2013 Office 2013 Professional Plus $6.16 Usually installs, but not officially supported Windows 7 Budget Windows 10 machines that only need the classic apps; no security updates since 2023.
Office 2010 Released 2010 Office 2010 Professional Plus $5.09 Usually installs, but not officially supported Windows XP SP3 Old PCs still on Windows 7, 8 or 10 that need basic Word and Excel; not for Windows 11 or sensitive work.

Office 2010–2019 follow Microsoft’s Fixed Lifecycle Policy; Office 2021 and 2024 follow the Modern Lifecycle Policy (five years, no extended support). After the end date the apps keep working, but Microsoft no longer ships security fixes for them. Microsoft Lifecycle

Frequently Asked Questions

Is Office 2021 still worth buying?

It depends on how long you need security updates. Office 2021 includes XLOOKUP and dynamic arrays, installs on Windows 10 and 11, and costs less than the 2024 release — but Microsoft's support end date for it is October 13, 2026. If you want patches after that, Office 2024 (supported until October 9, 2029) is the better choice.

How is Office 2021 different from Office 2024?

The core apps are the same. Office 2024 adds newer Excel functions (IMAGE, TEXTSPLIT, VSTACK and others), ODF 1.4 support and PowerPoint Cameo, and its support runs until October 9, 2029. Office 2021's support end date is October 13, 2026. Office 2021 is the cheaper option if you're fine with that date.

Is this a real Microsoft key or a trial?

A genuine one. This Office 2021 Professional Plus key activates straight against Microsoft's own servers — no trial, no shared account. Delivery is by email, usually within minutes, with the activation steps included.

What happens to Office 2021 after its October 13, 2026 end of support?

It keeps working and stays activated. Microsoft no longer releases security updates for it after that date, the same as for Office 2019 and earlier. If you want updates past that date, choose Office 2024 (supported until October 9, 2029).

Which Windows does it run on?

Windows 10 and Windows 11. It does not install on macOS — message us if you need Office for a Mac and we'll point you to the right option.

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Message Us on WhatsApp Or get Microsoft Office 2021 Key — $6.90