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...

Prepare for: Multiple account access to Copilot in Microsoft 365

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There is a new (As of January 30, 2025) policy setting is available in Cloud Policy, which will enable multiple account access to Copilot in Microsoft 365 desktop and mobile apps, allowing users to utilize Copilot across different signed-in accounts. 

The feature itself will allow a user to use a fully licensed Copilot feature from one tenant on "any" document available to them in a tenant they have access to. No matter if the user has Copilot in any of the other tenants. The feature will be rolled out globally from early March 2025 and is expected to be completed by late March 2025, but organizations might want to look into this policy and understand how it may or may not impact their existing security policies.

I recommend reading up on the following article, where details about what the user can access in different scenarios are described.

Here are some of the things to take into consideration: 

  • Copilot's data protection is based on the identity used to access the file, ensuring enterprise data protection regardless of the account used. 
  • The setting for web grounding in Copilot is also identity-based. If web grounding is disabled for a particular identity, it will remain disabled even when accessing Copilot from another account.
  • If a user is accessing a document in a different tenant, work grounded data from the home tenant will NOT be available
  • The feature will be available in most of the major apps. 
For organizations considering to restrict this behaviour, Microsoft has provided the following Learn Article.