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Is Classic Outlook Being Replaced by the New Outlook for Windows?

WPS Content Manager Oct 1, 2026 868 views

Question details

The user is seeking clarification on whether Microsoft is replacing the classic Outlook desktop application with the new Outlook for Windows and wants to understand the differences between them.

Is Classic Outlook Being Replaced by the New Outlook for Windows?

Product: Microsoft Outlook
Device & OS: Windows
Scenario: Understanding Microsoft's email client transition strategy and whether classic Outlook is being deprecated.
Observed behavior: Users want to know the current status of classic Outlook and how the rollout of the new Outlook for Windows affects their existing Microsoft 365 or Windows Mail setup.

Before you start

Before exploring the differences, check whether you are currently using the built-in Windows Mail app or the classic Outlook application included in Microsoft 365, as the transition affects these applications differently.

Solution 1Recommended

Understand Microsoft's Current Transition Plan for Outlook

Clarify the differences between the new Outlook and classic Outlook, and identify which applications are actually being replaced right now.

Microsoft has introduced the new Outlook for Windows as a modern, web-based application designed to unify the email experience across platforms.

Currently, the new Outlook is primarily replacing the built-in Windows Mail and Calendar applications, which are being phased out. Classic Outlook for Windows (part of Microsoft 365) is not being immediately removed and will remain available for existing subscribers.

Check your current email application

Open your email client. If you are using Windows Mail or Calendar, you will likely see a prompt or notice indicating that these apps are migrating to the new Outlook.

Manage the 'New Outlook' toggle

If you are a Microsoft 365 subscriber using classic Outlook, you can continue to use it. A 'Try the new Outlook' toggle may appear in the top-right corner of your application window, allowing you to test the new interface and switch back if desired.

Understand Microsoft's Current Transition Plan for Outlook

Support Timeline: Classic Outlook will remain supported for existing Microsoft 365 installations for the foreseeable future, though Microsoft's long-term transition plans may evolve.

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Frequently Asked Questions

Can I switch back to classic Outlook after trying the new Outlook?

Yes. If you tried the new Outlook from classic Outlook, you can switch back by clicking the 'New Outlook' toggle switch in the top-right corner of the application to turn it off.

What is happening to the Windows Mail and Calendar apps?

Microsoft is discontinuing the default Windows Mail and Calendar apps. Users of these applications are being automatically transitioned to the new Outlook for Windows.

Will classic Outlook stop working in the near future?

No, classic Outlook will continue to work and receive support for Microsoft 365 subscribers. Microsoft has stated that classic Outlook will be supported until at least 2029.

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