Microsoft has announced that the Microsoft 365 apps for Windows will start blocking access to files via the insecure FPRPC legacy authentication protocol by default starting late August.

These changes apply only to Microsoft 365 apps for Windows and will not affect Microsoft Teams users across Windows, Mac, web, iOS, or Android.

"Microsoft 365 apps will block insecure file open protocols like FPRPC by default starting version 2508, with new Trust Center settings to manage these protocols," the company said in a new Microsoft 365 Admin Center message on Wednesday.

"These changes enhance security by reducing exposure to outdated technologies like FrontPage Remote Procedure Call (FPRPC), FTP, and HTTP."

Starting with version 2508 of Microsoft 365 apps, file opens using the legacy FPRPC

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