Here’s a summary of the main points from the Neowin article and Microsoft’s update:
If you need technical migration or planning details for IT, let me know what kind of systems you have and I can offer steps or alternatives.
Source: Neowin Microsoft 365 will soon disable outdated authentication protocols for file access
- Microsoft 365 will disable legacy authentication protocols (Relying Party Suite [RPS] and FrontPage Remote Procedure Call [FPRPC]) for file access.
- This affects Microsoft 365 and Office apps, SharePoint, and OneDrive.
Timeline
- The change starts mid-July 2025.
- The rollout will be completed by August 2025.
Why is Microsoft Doing This?
- Security: Legacy protocols like RPS and FPRPC are considered insecure—they can be brute-forced, phished, and are vulnerable to various exploits.
- This is in line with Microsoft’s Secure Future Initiative (SFI).
Impact
- Applications/services using RPS or FPRPC for browser-based authentication to open Office files will no longer work.
- No licensing changes are required—the protocol change will be applied by default.
- Admin consent will be required for third-party access to files/sites after the change.
- IT admins will need to set up/administer consent workflows for these operations.
What Should IT Admins Do?
- Review systems/integrations that use RPS/FPRPC for file access in Office 365, SharePoint, and OneDrive.
- Update or replace any third-party apps or custom integrations that use these protocols.
- Follow Microsoft’s documentation to configure admin consent workflow for third-party access.
If you need technical migration or planning details for IT, let me know what kind of systems you have and I can offer steps or alternatives.
Source: Neowin Microsoft 365 will soon disable outdated authentication protocols for file access