Office 2021 vs Office 2024: Quick Comparison

• Release: Office 2021 came out in October 2021; Office 2024 in October 2024.
• Microsoft support ends: Office 2021 on October 13, 2026; Office 2024 on October 9, 2029.
• Apps in Professional Plus: 2021 includes Word, Excel, PowerPoint, Outlook, OneNote, Publisher, Access and Teams. 2024 includes Word, Excel, PowerPoint, Outlook, OneNote and Access. Publisher and Teams are not included in Office 2024.
• Excel: 2024 adds LAMBDA, TEXTSPLIT, TEXTBEFORE/TEXTAFTER, VSTACK/HSTACK, IMAGE and other modern functions that 2021 lacks (both have XLOOKUP and dynamic arrays).
• Look and feel: 2024 uses the current Office design with rounded corners and refreshed icons; 2021 keeps the older ribbon style.
• Windows requirement: both run on Windows 10 and Windows 11.
• Price at KRBKeys: Office 2021 Professional Plus and Office 2024 Professional Plus both cost $34.99; Office 2024 Standard is $29.99.

What's New in Office 2024

Office 2024 is based on the Microsoft 365 apps as they were in 2024, so it picks up three years of improvements that Office 2021 never received:

• Excel: LAMBDA for custom functions, TEXTSPLIT, TEXTBEFORE/TEXTAFTER, VSTACK/HSTACK, TAKE/DROP, the IMAGE function and better Power Query support. If you work in Excel every day, this alone is a reason to pick 2024.
• Word: improved Track Changes and comments, better document recovery, modern Draft and Focus modes.
• PowerPoint: cameo (embed your camera feed in slides), improved Recording Studio, new animation and design tools.
• Outlook: the classic desktop Outlook with search and calendar improvements, meeting insights and better large-mailbox performance.
• Performance and accessibility: faster startup, lower memory use, a refreshed interface that matches Windows 11, and improved screen-reader support.

Microsoft's Office LTSC 2024 overview lists the full set of changes. What Office 2024 does not add: it has no Copilot AI features and no cloud-only features from Microsoft 365. Those remain subscription-only.

Support Dates: Why They Matter

Support is the biggest practical difference. Microsoft stopped releasing security patches for Office 2021 in October 2026. After that, the apps keep working, but new vulnerabilities will not be fixed. Office 2024 is covered until October 2029, three more years. If you are buying today and plan to keep Office for several years, 2024 is the safer investment. If you need Office for a short project, a secondary PC, or you already know and prefer the 2021 layout, 2021 is still a perfectly good choice.

Editions Explained: Professional Plus vs Standard vs Home & Business

Office 2021 Professional Plus is the complete suite: Word, Excel, PowerPoint, Outlook, OneNote, Publisher, Access and Teams, for one Windows PC. KRBKeys also offers a 5 PC key at about $28 per PC.

Office 2024 Professional Plus (LTSC) includes Word, Excel, PowerPoint, Outlook, OneNote and Access. Office 2024 Standard (LTSC) includes the same apps without Access, at a lower price. Neither 2024 edition includes Publisher, which Microsoft has retired.

Office Home & Business for Mac (2021 and 2019) includes Word, Excel, PowerPoint and Outlook for macOS, with business use rights.

If you depend on Publisher for flyers, newsletters or labels, Office 2021 Professional Plus is the last version that includes it; this is the one case where 2021 is clearly the better pick.

Office 2021 vs Office 2024: Which One Should You Buy?

Choose Office 2024 if: you want the longest support (until 2029), you work seriously in Excel and want the modern functions, you like the current Office look, or you are buying Office for a new PC you will keep for years.

Choose Office 2021 if: you need Publisher or Teams built in, you want a 5 PC license for a family or small office, you are equipping an older or secondary PC, or you simply prefer the familiar 2021 interface and the 2026 support date is acceptable for your use.

At KRBKeys, both Office 2021 Professional Plus and Office 2024 Professional Plus are $34.99, so in the Office 2021 vs Office 2024 decision, price is not the deciding factor; support length and the Publisher question are. Office 2024 Standard at $29.99 is the best value if you do not need Access.

Installation and Activation

Both versions are delivered the same way: you receive a genuine retail key and the official Microsoft download link by email. Download the installer, run it, open any Office app, and enter the key under File → Account → Change Product Key (or when prompted on first launch). Before installing, uninstall any other Office version, trial or Microsoft 365 app on the PC, since mixed installations are the most common cause of "Product Key Is Not Valid" and "Unlicensed Product" errors. Our activation guides cover both errors step by step.

If You Bought Your Key From KRBKeys

Follow the activation steps in your order email. If Office rejects the key or shows an error, email support@krbkeys.com with your order number and a screenshot; we reply within 24 hours and replace the key if needed.