Office 365 isn't for everyone. Many users prefer free alternatives or a one-time purchase for Microsoft Office. The 7 Best Free Microsoft Office Alternatives Microsoft Office is king of the office suites but that doesn't mean it's right for you. Here are other office suites that you might like better! Read More
And even if you prefer Microsoft's suite, a perpetual license might better suit your needs.
Canceling your Office 365 subscription is straightforward, and you can do it anytime. Here's how, plus details on refunds and what happens to your apps afterward.

To cancel, follow these steps:
If you bought an annual plan within the last 30 days or cancel a monthly plan within 30 days of renewal, you're eligible for a full refund.
Requesting a refund stops access immediately—your Office apps switch to read-only mode. You can open and print files, but editing is disabled.
Without a refund, apps remain fully functional until the paid period ends.
Note: Cancellation ends all Office 365 perks, including extra OneDrive storage and Skype credits. Shared users lose access too.
For help choosing between subscription and one-time buy: Office 365 vs. Office 2016: Which is cheaper long-term? Contrary to popular belief, Office 365 is not a greed-driven move to make more money. Office 2016 and Office 365 serve different audiences. We will show you which is the best value for you. Read More