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EnglishWhat Is Outlook.com and How Does It Differ from Outlook in Microsoft 365?
Updated
Outlook.com is Microsoft's free web-based email and calendar service, accessed with a Microsoft account at outlook.com. It is not the same thing as the Outlook desktop app that comes with a Microsoft 365 plan. If you just need a personal inbox, calendar, and browser access, Outlook.com covers that at no cost. If you need the installed Outlook application, extra storage, or Copilot features woven into your work apps, that is where a Microsoft 365 plan comes in.
What Outlook.com actually is
Outlook.com is the consumer-facing mail and calendar service tied to a Microsoft account (the same account you might use for Windows, Xbox, or OneDrive). You open it in a browser, sign in, and get:
- An inbox with folders, rules, and spam filtering
- A calendar for personal events and reminders
- Contacts and basic task support
- Access from the web plus the Outlook mobile apps
The Microsoft 365 page describes the broader suite this way: "Microsoft 365 includes familiar apps like Word, Excel, PowerPoint, Outlook, Teams, and OneDrive, plus Copilot experiences that help you create, find, summarize, and get things done across your work." Outlook.com is the mail-and-calendar piece of that picture for personal use, without requiring a subscription.
Outlook.com vs. Outlook in Microsoft 365: the key differences
The name "Outlook" gets used for several things, which is the main source of confusion. Here is how the versions compare on the dimensions that matter:
| Dimension | Outlook.com (free web) | Outlook in Microsoft 365 |
|---|---|---|
| Cost | Free with a Microsoft account | Requires a paid plan (pricing varies by plan) |
| Where it runs | Browser and mobile apps | Desktop app (Windows/Mac), web, mobile |
| Primary audience | Personal email and calendar | Work, school, or individual productivity |
| Storage | Standard free mailbox allowance | Plan-dependent, generally larger |
| Copilot features | Not the focus | Copilot built into apps for drafting, summarizing, and search |
| Other apps included | None beyond mail/calendar | Word, Excel, PowerPoint, Teams, OneDrive |
The practical takeaway: choose Outlook.com if your need is a personal inbox and calendar you can reach from any browser. Choose a Microsoft 365 plan if you want the installed Outlook app, more storage, and the other Office apps with Copilot assistance.
How to start using Outlook.com
- Get a Microsoft account. If you already sign in to Windows, Xbox, or OneDrive, you have one. Otherwise create one at outlook.com — you'll choose an email address ending in @outlook.com (or use an existing address).
- Sign in at outlook.com. Enter your account credentials. You land in your inbox.
- Send a test email. Compose a message to yourself or a contact to confirm sending and receiving work.
- Set up your calendar. Open the calendar view and add an event with a date, time, and reminder to verify it appears correctly.
- Adjust basics. Set up folders, a signature, and spam rules as needed.
Expected result: a working inbox and calendar reachable from any browser, plus the Outlook mobile app if you install it.
Common snags:
- Wrong account type. A work or school account (Microsoft 365 for business) may not open at outlook.com the same way a personal account does. If sign-in loops or fails, check whether you're using a personal Microsoft account.
- Forgotten password. Use the account recovery flow from the sign-in page rather than creating a duplicate account.
- Browser issues. Clear cookies or try a private window if the page won't load past sign-in.
When the free version is enough — and when to upgrade
The Microsoft 365 page notes: "With a Microsoft account, you can use Word, Excel, and PowerPoint in your browser for free. For desktop apps, more storage, and additional premium features, you can explore Microsoft 365 plans."
So the decision rule is straightforward:
- Stay on free Outlook.com if you mainly need email and calendar, are comfortable in a browser, and don't need the installed Office apps.
- Move to a Microsoft 365 plan if you want the desktop Outlook app, larger storage, the full set of Office apps, and Copilot features for drafting, summarizing, and finding information across your work. The page lists plans for individuals and for business, with pricing on Microsoft's comparison pages — check current prices there rather than assuming.
One caution: don't read "free browser apps" as "everything is free." The page explicitly separates free browser use from paid plans for desktop apps, storage, and premium features. Verify what a specific plan includes before buying.
A quick way to tell which Outlook you're in
If you're already signed in somewhere and aren't sure which product you're using: a browser tab at outlook.com with a personal address is the free service. An installed application on your desktop, especially one showing Copilot prompts like "Improve my writing" or "Summarize this," is the Microsoft 365 version. That distinction explains most "why can't I find this feature" questions — the feature lives in the paid product, not the free web inbox.