External Sharing in SharePoint and OneDrive is changing: What You Need to Know

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In an ongoing effort to create a more secure environment by default, Microsoft is introducing an important security update that will affect how external users access content shared through SharePoint and OneDrive. Starting July 1, 2025, any links shared with external users before your organization enabled Microsoft Entra B2B integration will no longer work. This change applies to all organizations that have already enabled or will enable SharePoint and OneDrive integration with Microsoft Entra B2B (Most organizations I have looked into so far). External users trying to use old links will see an error message saying the organization has updated its guest access settings. To regain access, the content must be reshared. Highlights of how the change affects organizations who have enabled B2B: All external sharing will require guest registration. External users must be added as guests in your Microsoft Entra directory. Access will be managed through Microsoft Entra B2B Invitation Manager. T...

Custom Engine Agents in Microsoft 365 Copilot

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Agents in BizChat has been available for some time already, but now there is an upcoming update to Agents. The introduction of “custom engine agents” in Microsoft 365 Copilot! These specialized agents can be built on any large language model (LLM), toolchain, or orchestration tool, tailored specifically for your domain or tenant workflows. Initially supported in Microsoft Teams, this feature will soon be available in Microsoft 365 Copilot Business Chat (BizChat).  

The introduction of Custom engine agents enables your organization to create customized experiences using your own AI systems and orchestrators. You can design unique prompts, connect to any LLM, and integrate these custom agents with Microsoft 365 Copilot. After the rollout, users will be able to access these agents, provided they are enabled and deployed in the Microsoft 365 admin center under the Copilot tab.  You can read more about the feature on this page.

Eligible users can create agents using Microsoft Copilot Studio for low-code tools or the Microsoft Teams Toolkit in Visual Studio for pro-code solutions. Access to Copilot Studio requires enabling the Microsoft Power Automate free license.  

Users can deploy agents for individual tasks and share them with internal teams, but organization-wide sharing requires admin approval. 

This feature is associated with Microsoft 365 Roadmap ID 474439 and will hopefully be in preview during February. The current target for GA is a finished roll-out by end of April.