Citing a Windows Latest report, IT之家 says Microsoft will discontinue the Copilot themes feature in the new Outlook worldwide in mid-to-late October 2026, covering the new Outlook for Windows and macOS as well as Outlook.com on the web. The feature let users enter a description or pick a preset direction so Copilot could generate a visual style and apply it to the Outlook interface, and it had been promoted as a major update for the new Outlook on Windows 10 and Windows 11. In the same round of changes, Microsoft will also remove "Wrap up your day", which sent a Copilot prompt to produce a short inbox summary in the right sidebar, and it plans an October 2026 update that gives Outlook's Copilot experience a simpler, chat-centric design with improved navigation, chat layout and Work IQ controls. IT之家 relays Windows Latest's speculation that usage fell short of Microsoft's expectations; Microsoft has not publicly confirmed a reason.