Microsoft sells Office two ways: a one-time perpetual license (Office 2021 / 2024) and a subscription (Microsoft 365). Both give you Word, Excel and PowerPoint. The differences are in updates, cloud services, and how the cost adds up over years.

What Office 2021 gives you

  • Pay once, use forever. The license does not expire. No renewal, ever.
  • The classic desktop apps — Word, Excel, PowerPoint; Outlook, Publisher and Access in the Professional editions.
  • Security updates for the product's support lifecycle, but no new features. The apps stay as they shipped.
  • One PC or Mac per license.

What Microsoft 365 gives you

  • Always-current apps. New features arrive continuously, including the newer AI-assisted tools that never come to perpetual editions.
  • 1 TB OneDrive storage per user — this is a real cloud backup for your documents.
  • Multi-device installs: use on several PCs, Macs, tablets and phones simultaneously with one subscription.
  • Ongoing cost. Stop paying and the apps drop to read-only mode.

The cost crossover

A perpetual Office license typically costs the equivalent of one to two years of a Microsoft 365 subscription, depending on edition and where you buy. The arithmetic is simple: if you would keep the same Office version for three or more years — and most home and small-office users do — the one-time purchase is cheaper over its lifetime. If you want the newest features, the terabyte of OneDrive, or installs across a family of devices, the subscription earns its keep.

Feature reality check

Be honest about what you use. Word, Excel and PowerPoint as they exist in Office 2021 already do everything most people ask of them: pivot tables, mail merge, presenter view, track changes. The subscription's advantages are real, but they are advantages in cloud storage, collaboration and new features — not in the core editing anyone does daily.

Tip: real-time co-authoring works best when files live in OneDrive/SharePoint. If your team edits shared documents together all day, that workflow favors Microsoft 365. If you mostly email finished files, it does not.

Quick decision guide

  1. One computer, standard documents, hate subscriptions: Office 2021. Done.
  2. Family with many devices: Microsoft 365 — the multi-device rights usually beat buying several perpetual licenses.
  3. Small business with heavy shared-document collaboration: Microsoft 365.
  4. Business that standardizes on a version for years (common with accounting and ERP integrations): perpetual Office 2021 keeps every desk identical and predictable.

Can you switch later?

Yes, in either direction. Perpetual Office and Microsoft 365 install from the same family of installers, and documents are fully compatible both ways. Nothing locks you in permanently.

We carry Office 2021 Professional Plus and other Office licenses with instant email delivery — one payment, permanent license, replacement warranty included.