Microsoft is rolling out a new Classic Outlook theme for users of the new Outlook client, part of a broader effort to ease the transition from the legacy application. The theme began a targeted rollout in mid-August, with completion expected by the end of September, before becoming generally available worldwide between late September and late October. According to Microsoft鈥檚 365 Message Center, the setting will apply coordinated changes across the Outlook experience, including visual styling, layout, typography, icons, and selected interactions.
The feature will not override existing administrator configurations, nor will it automatically migrate users from classic Outlook to the new Outlook. For most users, the theme will be off by default, but Microsoft said it will enable the setting by default for some users moving from classic Outlook to the new client as part of the phased rollout, who can turn it off at any time. Those who receive the default setting can switch back to the standard theme via Settings, General, and Appearance, and the toggle will remain available to all users.
Microsoft described the update as a way to provide a more familiar experience for people transitioning from classic Outlook while maintaining the capabilities of the new Outlook. The new Outlook, also known as Outlook for Windows, replaced Windows Mail as a pre-installed app on Windows 11 in October 2023 and on Windows starting in January 2025, though it still lacks some features found in the classic client. The first preview of the new Outlook was introduced in May 2022, with general availability for personal accounts arriving in September 2023 and for commercial customers in August 2024.
The company has previously adjusted its timeline for moving business users off the classic client. In February, Microsoft announced it would postpone the opt-out phase for businesses from April 2026 to March 2027, giving enterprise administrators an additional 12 months to prepare a staged migration. Microsoft said at the time that it was seeing strong and accelerating adoption of the new Outlook, even as it extended the deadline.
In a separate but related move, Microsoft said in July that it will disable Outlook Web Access Light, a lightweight version of the Outlook Web App that has been available for roughly two decades as an alternative to the premium version, in a future Exchange Server update. That change, like the new theme, is aimed at streamlining the company鈥檚 email client offerings. The Classic Outlook theme itself is designed to give users a familiar look without forcing a switch, and the setting can be toggled on or off at any time.
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