Office 2021 vs Office 2024 vs Microsoft 365: which should you buy?
Last updated October 15, 2026
Buy Office 2021 or Office 2024 as a one-time purchase if you want Word, Excel, PowerPoint and Outlook on one machine and do not need new features later. Buy Microsoft 365 if you want ongoing feature updates, cloud storage and several devices, and are willing to pay every month or year.
What is the actual difference?
The applications are the same applications. The difference is the commercial model, and everything else follows from it.
| Office 2021 | Office 2024 / LTSC 2024 | Microsoft 365 | |
|---|---|---|---|
| Payment | Once | Once | Recurring, monthly or yearly |
| New features after purchase | No | No | Yes, as they ship |
| Security updates | Within its support window | Within its support window | For as long as the subscription runs |
| Cloud storage | Not included | Not included | 1 TB per user on Personal and Family |
| Devices | As stated by the edition | As stated by the edition | Personal: several devices, one person. Family: up to six people |
| Works offline | Yes | Yes | Yes, though it checks in for licensing |
| Stops working if you stop paying | No — yours permanently | No — yours permanently | Yes, reverts to read-only |
Office 2021 or Office 2024 — is the newer one worth it?
Office 2024 is the later perpetual release, so it starts with a longer support window ahead of it and includes the feature work Microsoft shipped since 2021. Office 2021 is cheaper and, if you are buying at a point when its support window is nearly done, that is the trade you are making.
For a machine you will keep for a few years, buying the later release means fewer years where you are running an unsupported build. For a machine you are replacing soon, it matters less.
Both are the classic desktop applications. Neither includes the cloud storage or the continuous feature updates of a subscription.
Which editions exist, and what do the names mean?
The names describe which applications are included, not quality tiers.
- •Home — Word, Excel, PowerPoint. The essentials, one person.
- •Home & Business — Home plus Outlook, and generally licensed for commercial use.
- •Professional / Professional Plus — the full set, adding Access and Publisher, plus business features such as shared database support.
- •LTSC — the volume-licensing long-term servicing channel: same applications, no cloud-connected features, administered by an organisation.
Each product page in the catalogue names the edition and states what its licence tiers cover, so the exact terms for a specific title are on that page rather than inferred from the name.
I only need Word, Excel and PowerPoint. Which one?
If those three on one computer is the whole requirement, a one-time purchase is usually the better value: you pay once and it keeps working. A subscription makes sense when you would otherwise be paying for cloud storage anyway, or when you need to install across several devices.
What happens to my files if I stop paying for Microsoft 365?
Your documents are yours and stay on your disk, but the applications drop to a reduced-functionality mode: you can open and print files, but not create or edit them. OneDrive storage above the free allowance is also affected.
A one-time-purchase licence has no such state. It does not expire.
Frequently asked questions
▸Is Office 2024 a subscription?
No. Office 2024 and Office LTSC 2024 are one-time-purchase releases. Microsoft 365 is the subscription product. The two are separate product lines sold side by side.
▸Can I install a one-time-purchase Office on more than one computer?
Only as many devices as the edition and tier you bought allow — commonly one PC or Mac for the home editions. The licence tier is stated on the product page for the specific title.
▸Do I need Microsoft 365 to use Word, Excel and PowerPoint?
No. The one-time-purchase editions include the same desktop applications and work indefinitely. What they do not include is cloud storage and feature updates after release.
▸Which is cheaper over five years?
A one-time purchase, if you would not otherwise pay for cloud storage and do not need features added after release. A subscription costs more in total but spreads the payment and keeps the software current — the right choice depends on whether those two things matter to you.
