The per-group sharing controls are a new Office 365 feature that allows SharePoint Online administrators to limit the ability to share with external users to those in specified security groups. These controls affect OneDrive for Business and SharePoint Online in Office 365.
Per-group sharing controls will appear in two phases. First, you will notice a new setting that allows users to specify a set of security groups that are allowed to share to authenticated external users and via anonymous links. Second, another option will appear that allows admins to specify a set of security groups that are allowed to share to authenticated external users only.
- Let only users in selected security groups share with authenticated external users - With this option, you can specify one or more Office 365 security groups which contain the users who you want to allow to share with authenticated external users. Users in these security groups will not be able to send anonymous links.
- Let only users in selected security groups share with authenticated external users and using anonymous links - With this option, you can specify one or more Office 365 security groups which contain the users who you want to allow to share with authenticated external users and by using anonymous links. (This option doesn't appear unless you have enabled anonymous access links for the tenant.)
We'll be gradually rolling this out to First Release customers in early June, and then continue the roll-out to all other tenants over the following weeks.
What do I need to do to prepare for this change?
There is nothing you need to do to prepare for this change