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...

Security enhancements in Microsoft Teams

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Collaboration Security for Microsoft Teams was announced back in March, but we are now seeing some of these features being released to customers subscribing to Microsoft Defender Plan 2.

Report suspicious chats or channels was one of these new features, and it should be rolling out during August. The feature is enabled by a new policy setting which is turned on by default. Admins can control this setting in the "messaging policies" in the Teams admin center.

Other features controlled by new policy settings are "URL blocking" and "ZAP protection".