Edge retires its legacy Windows sign-in from early November 2026

Edge retires its legacy Windows sign-in from early November 2026

7 October 2026: Microsoft is retiring the older sign-in code that Edge on Windows uses to talk to the Windows account system, and moving every profile to its OneAuth library instead. Message Center post MC1490911 says the rollout begins in early November 2026 and is expected to finish in early November 2026.

Not yet independently verified. Single source: the merill.net archive of the Microsoft 365 Message Center post. We have not read the original in the admin center, and Microsoft can still revise the dates. We will update this when it can be confirmed, and remove this note.

The change affects organisations running Edge on Windows whose profiles have not yet been migrated to OneAuth. It also reaches any that switched OneAuth off with the command-line flag --disable-features=msOneAuthWAM, since the retirement removes the implementation they fell back on. Version 157 is the point at which the new behaviour is enforced, and the post warns that support teams should be ready for users to see sign-in prompts after version 157 is deployed.

Microsoft gives administrators four things to do:

1. Find unmigrated profiles by opening edge://signin-internals in the browser and checking the Library setting.
2. Test the move on pilot devices running Edge 155 or later, using the flag msedge.exe --enable-features=msForceOneAuthWAM.
3. Brief the help desk on the prompts users may meet once version 157 arrives.
4. Collect diagnostic logs, with the command-line parameters the post lists, if sign-in problems appear during testing.

Microsoft does not say whether the sign-in prompts will affect signed-in work profiles differently from personal ones, or how many profiles it expects to be unmigrated. Organisations that pin Edge versions or hold updates back will meet the change when they next move to version 157, not necessarily in early November.

Related on TrustList:

• Microsoft 365 will retire Targeted Release in January 2027

Sources

• Microsoft 365 Message Center archive (merill.net): MC1490911 Microsoft Edge: Retiring legacy sign-in implementation on Windows, 7 October 2026