Microsoft Adds Classic Theme Toggle to New Outlook, Visual Only
Microsoft has introduced a classic theme toggle for the new Outlook, allowing users to switch to a visual style resembling the classic version without changing underlying functions. The option is available under Settings > General > Appearance and can be toggled on or off. It will not be enabled by default. The company reiterated no plans to rebuild a native client, as the new Outlook is web-based via WebView2. Microsoft postponed forced installation for enterprise PCs to early 2027 and still plans migration with an opt-out.
Microsoft has released a "classic skin" theme for the new Outlook, aimed at easing the transition for users who have not yet upgraded by adding a sense of familiarity. The theme toggle is located under Settings > General > Appearance. Once enabled, the new Outlook will mimic the visual style of the classic version, including visual styling, layout, fonts, icons, and some interaction patterns. Microsoft stated that the toggle will be rolled out to all new Outlook users, can be switched on or off at any time, and will not be enabled by default for most users.
The new Outlook has been available for three years and has received significant improvements in recent months. Microsoft continues to add features that have existed in the classic version for years, including offline support and, more recently, PST file support. Because feature updates cannot replicate the look and feel of the classic version, Microsoft introduced the theme feature. However, the theme only changes visual presentation and does not restore the underlying experience of the classic version. The two versions have fundamentally different architectures: the classic Outlook is a native Win32 application, while the new Outlook is a web-based application built on WebView2. Microsoft has explicitly stated that there are no plans to redevelop a native email client.
Microsoft also clarified that the theme does not change the actual logic or operational behavior of the classic Outlook, will not automatically force users to migrate, and will not affect existing configurations made by administrators for deployments of the new Outlook. Previously, Microsoft postponed the plan to force-install the new Outlook on enterprise computers to early 2027, and it still intends to push users to migrate to the new Outlook in 2027, while also providing an opt-out option.