Office Settings & Configuration

How to Switch Back to Classic Outlook and Fix Microsoft 365 Interface Issues

Maira Mehtab Sep 20, 2026 869 views

Question details

Users are experiencing difficulties adapting to the new Microsoft 365 interfaces for Outlook and Excel, reporting missing features, changed menus, and broken workbook links, and are seeking ways to revert to the classic versions.

Product: Microsoft 365 (Outlook and Excel)
Device & OS: not provided
Scenario: Navigating the newly updated Microsoft 365 application interfaces and trying to restore familiar layouts and tools.
Observed behavior: The new interface disrupts standard workflows due to rearranged menus, altered attachment handling, and broken Excel workbook links, prompting users to return to the legacy interface.

Before you start

Before modifying your Office installation, completely close all running Microsoft 365 applications, including Outlook and Excel, via the Windows Task Manager to prevent file lock conflicts during the rollback.

Solution 1Recommended

Toggle Back to the Classic Outlook Interface

Use the built-in toggle switch to instantly disable the new layout and return to the familiar classic Outlook interface.

Microsoft includes a direct toggle within the New Outlook application that allows users to easily switch back to the legacy interface without needing to uninstall any software.

Open New Outlook

Launch the new Microsoft Outlook application from your Start menu or taskbar.

Locate the toggle switch

Look in the top-right corner of the application window, near the minimize and close buttons, for a toggle switch labeled 'New Outlook'.

Switch off the new interface

Click the toggle to the 'Off' position. A prompt may appear asking for feedback; you can provide your reasons or simply choose to skip it. Outlook will then close and automatically reopen in the classic view.

Quick Rollback: You can use this same toggle in the classic version to preview the New Outlook whenever you are ready to try it again.

Solution 2

Reinstall Microsoft Office to Fix Interface and Link Bugs

If reverting to classic Outlook does not resolve persistent Excel issues like broken gridlines or workbook links, a clean reinstallation of Microsoft 365 is required.

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Avoid Interface Frustrations with WPS Office

If the constant interface changes and feature migrations in Microsoft 365 disrupt your workflow, consider switching to WPS Office. It provides a stable, familiar, and highly intuitive classic tabbed interface that makes managing documents and spreadsheets straightforward.

1. Download WPS Office: Visit the official WPS Office website and download the free installation package.
2. Install the software: Run the setup file and follow the simple on-screen instructions to install the suite.
3. Open existing Office files: Launch WPS Office and directly open your Excel, Word, or PowerPoint files with perfect formatting preservation.

Familiar classic interface with no forced UI overhaulsFully compatible with Microsoft Excel (.xlsx), Word (.docx), and PowerPoint formatsLightweight application that runs smoothly even on older hardwareFree to use for everyday document creation and editing tasks

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Frequently Asked Questions

Why did Microsoft change to the New Outlook interface?

Microsoft introduced the New Outlook to create a unified code base across Windows, Mac, and web platforms, ensuring a consistent user experience and faster deployment of new features, even though it initially lacks some classic tools.

Will Classic Outlook be permanently discontinued?

While Microsoft is actively pushing the new interface, they have officially stated that Classic Outlook for Windows will remain supported until at least 2029.

How can I fix broken workbook links in the new Excel?

If workbook links are failing after an update, verify your Trust Center settings to ensure external links are permitted. If the issue persists across the new UI, reinstalling Office and reverting to the classic layout often resolves the gridline and link bugs.

Can I use both New Outlook and Classic Outlook at the same time?

Yes, you can easily toggle between the two versions using the switch in the upper-right corner of the application window, allowing you to test the new features without losing access to your classic workflow.

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