Microsoft Office comes as either a one-time purchase or a monthly subscription, and which one makes sense depends on how often you use it and whether you want updates included
Microsoft Office is a set of programs — Word for documents, Excel for spreadsheets, PowerPoint for presentations, and Outlook for email — that you can own outright or rent by the month. If you buy it once, you keep that version forever but never get new features. If you subscribe, you pay monthly and always have the newest version, plus cloud storage and tech support. There is also a free web version that works in your browser, and a free desktop version for students and some nonprofits.
The choice between buying and subscribing usually comes down to cost over time and whether you need the newest tools. Someone who writes one document a year might buy once. Someone who uses Office daily for work probably subscribes because the updates matter and the monthly cost spreads out.
Key Takeaways
- Microsoft 365 is the subscription option that costs roughly $7 to $20 per month depending on which plan you choose, includes all programs, and updates automatically.
- Office 2021 or Office 2019 is a one-time purchase of $160 to $250 that gives you Word, Excel, and PowerPoint forever, but you never receive new features or security updates after purchase.
- Microsoft Office online is free in your web browser if you have a Microsoft account, works on any device, and saves files to OneDrive automatically.
- Students and staff at schools that have a Microsoft agreement can read Office desktop programs for free through their school email.
- You buy or subscribe through Microsoft.com directly, through retailers like Best Buy or Amazon, or through your employer or school.
The subscription option: Microsoft 365
Microsoft 365 is a monthly or yearly subscription that gives you all the Office programs plus cloud storage, tech support, and automatic updates. The most common plan is Microsoft 365 Personal, which costs about $7 per month if you pay yearly or $10 per month if you pay month-to-month, and covers one person on up to five devices. Microsoft 365 Family costs roughly $10 per month yearly or $13 month-to-month and covers up to six people, each with their own account and storage.
When you subscribe, Microsoft sends you updates automatically — sometimes monthly, sometimes more often — so you always have the newest version. If Microsoft adds a new feature or fixes a security problem, you get it without doing anything. Your files save to OneDrive, Microsoft's cloud storage, so you can open them from any device. If your subscription lapses, you can still read your old files, but you cannot edit them until you renew.
Subscription makes the most sense if you use Office regularly, want the newest features, or need to work on files from different devices. It also makes sense if you are not sure you will use Office long-term, because you can cancel anytime instead of being stuck with a program you do not use.
The one-time purchase option: Office 2021 or Office 2019
You can buy Office as a standalone product — usually Office 2021 or Office 2019 — for a single price between $160 and $250 depending on which programs you want. Once you buy it, you own that version forever. You can install it on one computer and use it as long as that computer runs. You never pay again, and you never have to worry about a subscription ending.
The trade-off is that you never receive updates. If Microsoft releases a new version in three years, you still have the old one. If a security problem is discovered, Microsoft will not fix it in your copy. You also do not get OneDrive storage or tech support included. If something breaks, you are on your own or paying for help separately.
One-time purchase makes sense if you use Office rarely, do not need the newest features, or want to avoid monthly bills. It also makes sense if you work offline most of the time and do not need cloud storage. However, if you use Office daily or for work, the cost of a subscription usually works out cheaper over a few years, and the automatic updates matter for security.
The free option: Office online and student versions
Microsoft Office online is a free version that runs in your web browser — Chrome, Edge, Safari, or Firefox — and works on any device with internet. You get Word, Excel, PowerPoint, and OneNote. The online versions are simpler than the desktop programs and do not have every feature, but they handle most everyday tasks. Your files save automatically to OneDrive, so you can access them from any computer or phone.
To use Office online, you need a free Microsoft account. Go to Office.com, sign in or create an account, and click the program you want. You can create a new document, upload an existing one, or open a file that is already in your OneDrive. The online version is genuinely free — no trial period, no hidden cost, no subscription required.
If you are a student or work at a school or nonprofit, you may have access to the full desktop version of Office for free through your school email. Ask your school's IT department or check your school's software portal. Many schools include Office as part of their Microsoft agreement, so the cost is already built into what the school pays.
Where to buy or subscribe
You can get Microsoft Office from several places. Microsoft.com is the official source and usually has the current prices and all available plans. Amazon and Best Buy sell both subscriptions and one-time purchases, sometimes with discounts or bundled with other software. Costco occasionally offers discounted subscriptions if you are a member. Your employer may offer Microsoft 365 as part of your job, in which case you read it through your work account at no cost to you.
When you buy from a retailer, you usually receive a product key — a code that you enter on Microsoft.com to set up your purchase. When you subscribe, you set up a payment method and your subscription renews automatically unless you cancel. Make sure you know whether you are buying a one-time license or starting a subscription, because the renewal terms are different.
How to install Office on your computer
If you bought Office or have a subscription, go to Account.Microsoft.com, sign in with the account you used to buy or subscribe, and look for "Install Office" or "My Account." Click it and choose which programs you want to install and which computer you want to install them on. read the installer, run it, and follow the prompts. Installation usually takes 10 to 20 minutes depending on your internet speed.
If you are installing a one-time purchase, you will enter your product key during installation. If you are installing a subscription, you sign in with your Microsoft account and the subscription activates automatically. You can install on multiple devices — up to five for Personal, unlimited for Family — but only one person can use each subscription at a time unless you have a Family plan.
Comparing the options side by side
| Option | Cost | Updates | Cloud Storage | Best For |
|---|---|---|---|---|
| Microsoft 365 Personal | $7–$10/month | Automatic, always current | 1 TB OneDrive included | Regular users, multiple devices |
| Microsoft 365 Family | $10–$13/month | Automatic, always current | 1 TB per person | Households with multiple users |
| Office 2021 or 2019 | $160–$250 one time | None after purchase | Not included | Occasional users, offline work |
| Office online | Free | Always current | Free OneDrive included | Light users, any device, browser only |
| Student/nonprofit version | Free through school or org | Varies by institution | Varies by institution | Students and nonprofit staff |
Frequently Asked Questions
Can I use Microsoft Office on a Mac?
Yes. Microsoft 365 works on Mac, iPad, and iPhone. One-time purchases like Office 2021 also come in a Mac version. Office online works in any browser on any device. When you buy, make sure you are getting the Mac version, not the Windows version, or check the system requirements before you buy.
What happens to my files if my subscription expires?
Your files stay in your OneDrive and you can still read them, but you cannot edit them in the Office programs until you renew your subscription. You can read them as regular files and open them in another program, or you can use Office online for free to edit them. If you renew your subscription, you can edit them again in the desktop programs.
Is Office online the same as the desktop version?
Office online has most of the common features but not all of them. It is good enough for writing, basic spreadsheets, and straightforward presentations. If you use advanced features like macros, complex formulas, or detailed design tools, you need the desktop version. The best way to know is to try Office online for free and see if it does what you need.
Can I share my subscription with someone else?
Microsoft 365 Family is designed for sharing — up to six people can each have their own account and install Office on their own devices. Microsoft 365 Personal is for one person only, and sharing it violates the terms of service. If you want to share with family members, upgrade to Family instead.
Do I need to buy antivirus software separately if I have Microsoft 365?
Microsoft 365 does not include antivirus. Windows Defender, which comes built into Windows, provides basic protection. If you want more advanced protection, you can buy antivirus software separately or use a free option like Avast or AVG. This is separate from your Office subscription.