Outlook: Sort improvements to the message list

When sorting on Outlook for Web or Outlook for Windows, if the Sort By field is not one of From, Subject, or Date Received, we will now show an additional column for the Sort By value (e.g., Size). We will also support sorting by Flag Due Date. Product Outlook Release phase General Availability Release date June CY2026 Platform Desktop Cloud Instance Worldwide (Standard Multi-Tenant), GCC, GCC High, DoD Created 2026-05-29 22:30:02Z Roadmap ID 564803 Roadmap Link https://www.microsoft.com/microsoft-365/roadmap?id=564803

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