Microsoft Lets Users Restyle New Outlook to Look Like Outlook Classic

New Outlook Classic Outlook theme support is the latest tool Microsoft has added to soften its long-running app transition. The Register reported on 2026-08-21 that Microsoft is rolling out a setting that changes New Outlook's visual style and layout to look and feel like the older, familiar Classic Outlook interface. The theme applies to both New Outlook for Windows and the browser-based Outlook on the Web, so the same look can follow a user between desktop and browser sessions.

Microsoft framed the update as a way to help users who are moving off Classic Outlook get a more comfortable starting point, according to the report, while keeping New Outlook's current architecture and capabilities underneath. In other words, the change touches how the ribbon, panes, and menus are arranged and rendered, not what the app can actually do.

The timing lines up with Microsoft's broader migration schedule. Per guidance summarized on Microsoft's Q&A forum, Classic Outlook is due to enter an opt-out phase starting in April 2026, at which point New Outlook becomes the default experience for most users, though a temporary switch back to Classic Outlook will still be available during that stage. A visual bridge that makes New Outlook feel closer to what long-time users already know could reduce help-desk friction as that default flips for large user populations.

For MSPs and internal IT teams still rolling out New Outlook across a fleet, a familiar-looking interface can lower the retraining burden that typically accompanies a UI overhaul, even though the underlying application logic hasn't changed.

Crucially, the cosmetic theme will not add back Classic Outlook capabilities that New Outlook currently lacks, The Register's report noted. That distinction matters because the feature gap between the two apps is well documented and substantial, not cosmetic.

• VBA macros, COM add-ins, and the Outlook Object Model are not supported in New Outlook.
• MAPI and multiple mail profiles are not supported.
• Rules import/export is not supported; general rules functionality is only partially available.
• PST files, public folders, and some network-share or offline scenarios are only partially or not supported.

Microsoft's transition to New Outlook for Windows follows a three-stage rollout: opt-in, opt-out, and cutover. New Outlook has already reached general availability, and Classic Outlook remains available during the current opt-in stage, where users can try New Outlook while retaining access to the older app.

Beginning April 2026, the opt-out stage starts, making New Outlook the default for most users, though a temporary switch back will remain possible. A final cutover date, when Classic Outlook is fully retired for most users, has not been announced. Customers on Microsoft 365 subscriptions with desktop apps, or on perpetual licenses such as Office LTSC, will keep Classic Outlook support, including security updates, at least through 2029.

Independent of the new theme, both apps already include a built-in toggle for moving between them. In Classic Outlook, selecting "Try the new Outlook" in the upper-right corner starts the switch, followed by a first-run setup that offers to import supported settings and accounts, though this does not reproduce every Classic Outlook feature.

In New Outlook, the same top-right toggle offers "Switch back to classic Outlook" for a permanent change, or "Use classic Outlook this time" for a single session that reverts to New Outlook on the next launch. Administrators managing a fleet with a mix of standalone and Microsoft 365 Office editions should note that the switch controls can be hidden by organizational policy or unsupported on some one-time-purchase editions.

The near-term item to track is the April 2026 opt-out switch itself, when New Outlook becomes the default for most users while Classic Outlook remains selectable temporarily. Organizations that depend on VBA macros, COM add-ins, multiple mail profiles, or PST-heavy workflows should keep testing those processes in New Outlook before that default shifts, since the new theme changes appearance only.

No cutover date for fully retiring Classic Outlook has been announced, and Microsoft has said it will give advance notice before any final retirement for home users. Enterprise customers on qualifying licenses have a longer runway, with Classic Outlook support continuing at least through 2029.

The new theme changes New Outlook's look and layout only; it does not restore Classic Outlook features that IT teams and power users still depend on.

Microsoft is giving New Outlook and Outlook on the Web a Classic-style theme that changes appearance without restoring Classic Outlook's missing functionality.