# Microsoft Outlook software updates and features

> Live situation record from CLSTR: https://clstr.news/situations/microsoft-outlook-software-updates-and-features
> Updated: 2026-09-11T21:00:58.000Z. Sources: 6. Developments: 2.

Microsoft has introduced updates and changes to its Outlook email client ecosystem. In late August, the company began rolling out an optional ‘Classic Outlook’ design theme for the web-based version and the new Outlook for Windows. This update serves as a visual ‘skinning’ of the interface to provide a more familiar environment for users transitioning from older desktop clients, though it does not alter underlying functionality.

Concurrently, the new Outlook—which serves as a replacement for the discontinued Windows Mail application—includes advertisements in the inbox for users without a Microsoft 365 subscription. While the new version offers a modern interface, it lacks certain professional features found in the classic version, such as robust offline modes and support for COM add-ins. Users seeking an ad-free experience can access the classic version through one-time purchases like Office 2024 Professional Plus.

## Timeline

### 2026-09-11: Microsoft Outlook introduces ads for non-subscribers

Users transitioning from Windows Mail to the new Outlook are encountering advertisements in their inboxes unless they subscribe to Microsoft 365. The classic, ad-free Outlook remains available via Office 2024.

2 sources. https://clstr.news/cluster/microsoft-outlook-introduces-ads-for-non-subscribers

### 2026-08-24: Microsoft rolls out classic design theme for Outlook

Microsoft is deploying an optional “Classic Outlook” design theme for web and Windows users to provide a more familiar interface during the transition from older versions.

4 sources. https://clstr.news/cluster/microsoft-updates-outlook-and-hotmail-access-and-interface

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Cite as: Microsoft Outlook software updates and features. CLSTR, https://clstr.news/situations/microsoft-outlook-software-updates-and-features