Microsoft lets you swap New Outlook's looks with the face of Outlook Classic
- ID
- 16471
- Status
- summarized
- Published
- 21 Aug 2026, 7:15 PM
- Fetched
- 21 Aug 2026, 11:39 PM
- Provider
- The Register
- Category
- technology
- Original URL
- https://www.theregister.com/applications/2026/08/21/microsoft-lets-you-swap-new-outlooks-looks-with-the-face-of-outlook-classic/5290948
- Source URL
- https://www.theregister.com/headlines.atom
Summary
- Score
- 2.5
- Created
- 21 Aug 2026, 11:41 PM
- Tags
- Audience
- developerssaas_founders
What happened
Microsoft is rolling out a theme setting for Outlook on the Web and New Outlook for Windows that makes them visually resemble Classic Outlook, with targeted release complete by end of September 2026 and general availability by end of October. The toggle only changes appearance—missing features like robust offline support, full .pst handling, and COM add-ins remain absent, and COM add-ins will never come to New Outlook. Classic Outlook support continues until at least 2029, with the opt-out phase pushed to 2027.
Why it matters
If your team or customers rely on Outlook COM add-ins or full offline/.pst workflows, this cosmetic toggle changes nothing—plan migrations or alternative tooling now, since those capabilities will never arrive in New Outlook.
Discussion angle
Whether any builder in the group actually ships Outlook-integrated tooling and what the COM add-in deprecation means for their roadmap.