MC1055555 – (Updated) Microsoft SharePoint Online: We will remove retired DISCO and WSDL web pages

Product:

Microsoft Graph, SharePoint

Platform:

Developer, Online, Web, World tenant

Status:

Change type:

Admin impact, Retirement, Updated message, User impact

Links:

Details:

Summary:
Microsoft SharePoint Online is removing retired ASP.NET DISCO and WSDL web pages by November 2025. These legacy endpoints, rarely used and outdated since 2013, should be replaced with Microsoft Graph for remote operations. Organizations should verify if these pages are in use internally.

Details:
Updated October 20, 2025: Removal of these pages have started in late October 2025 and will be fully completed by end of November 2025.
ASP.NET DISCO and WSDL pages were the web service APIs for customers who wanted to create a proxy for their web services. The retirement of ASP.NET web services was announced in 2013 and should not be used. We encourage customers to move away from consuming these pages and use Microsoft Graph for remote operations where possible.
Please refer to the following information regarding the DISCO and WSDL endpoints
These endpoints were originally designed for use with development tools from the early 2000s and were never a preferred or widely adopted method for generating proxy classes in SharePoint development.
These endpoints are not tenant-specific and are not associated with any individual tenant's configuration or ownership.
Usage across the SharePoint Online service is extremely rare. In fact, most of these endpoints show zero usage.
These endpoints were primarily used in legacy development scenarios and are not required for modern SharePoint development practices.
If your organization has an internal development team, we recommend consulting with them to confirm whether these endpoints are in use. However, it is extremely unlikely that they are being used in any current development workflows.
Learn more: Removal of deprecated DISCO & WSDL aspx pages from SharePoint Online - Microsoft 365 Developer Blog

Change Category:
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Scope:
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Release Phase:

Created:
2025-04-15

updated:
2025-10-21

Task Type

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Docu to Check

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MS Preperations

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summary for non-techies**

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Direct effects for Operations**

Removal of Legacy APIs
The removal of DISCO and WSDL web pages may disrupt any existing internal applications or scripts that rely on these legacy APIs, leading to potential failures in functionality.
   - roles: Developers, IT Administrators
   - references: https://devblogs.microsoft.com/microsoft365dev/removal-of-deprecated-disco-wsdl-aspx-pages-from-sharepoint-online/

Increased Dependency on Microsoft Graph
Organizations will need to transition to Microsoft Graph for remote operations, which may require additional training and adjustments in development practices, impacting productivity during the transition period.
   - roles: Developers, Project Managers
   - references: https://learn.microsoft.com/graph/use-the-api

User Experience Disruption
If any internal tools or applications fail due to reliance on the removed APIs, users may experience disruptions in their workflows, leading to decreased efficiency and frustration.
   - roles: End Users, Support Staff
   - references: https://devblogs.microsoft.com/microsoft365dev/removal-of-deprecated-disco-wsdl-aspx-pages-from-sharepoint-online/

Potential Data Access Issues
Legacy systems that depend on the removed endpoints may face data access issues, resulting in incomplete data retrieval or processing errors, affecting decision-making processes.
   - roles: Data Analysts, Business Intelligence Teams
   - references: https://learn.microsoft.com/graph/use-the-api

Increased Support Requests
The transition away from DISCO and WSDL may lead to an increase in support requests as users encounter issues with legacy systems, straining IT support resources.
   - roles: Help Desk Staff, IT Support Managers
   - references: https://devblogs.microsoft.com/microsoft365dev/removal-of-deprecated-disco-wsdl-aspx-pages-from-sharepoint-online/

Configutation Options**

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Potentional Risks**

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IT Security**

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explanation for non-techies**

Microsoft SharePoint Online is making a change by removing some old web pages called DISCO and WSDL by November 2025. Think of these pages like outdated tools in a toolbox that no one uses anymore. They were once used for specific tasks in web development, much like how a VHS tape was used to watch movies. Just as most people have moved on to streaming services for watching films, SharePoint users are encouraged to switch to a more modern tool called Microsoft Graph for similar tasks.

The DISCO and WSDL pages were designed for older development practices and are not commonly used today. It's like having a rotary phone in a world where everyone uses smartphones. These pages are not tied to any specific organization, meaning they don't belong to any particular company or user group. In fact, most of these pages are not being used at all anymore.

For organizations, it's a good idea to check with your IT or development team to see if these pages are being used. However, it's highly unlikely they are part of any current projects, as they are not needed for modern SharePoint development. Moving forward, Microsoft Graph is the recommended tool for any remote operations in SharePoint, much like how modern apps have replaced older software for everyday tasks.