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

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...

Users of classic Teams will be moved to New Teams soon.

Microsoft Teams has announced that it will automatically upgrade classic Teams users to new Teams after March 31, 2024. Though the upgrade will not apply to Virtualized Desktop Infrastructure (VDI) users, be aware that classic Teams on VDI support will end on June 30th 2024 as well as for the regular desktop. 

If you are a classic Teams user, you will at first see banner messages encouraging you to move to the new client. If you postpone the upgrade, you will have to do the upgrade on June 30th 2024 

If you are an admin and want to control the process, take a look at the following article on how to use policies in Teams Admin center.