<p>External sharing notifications for OneDrive for Business is a new Office 365 feature. We will begin rolling this feature out in late August, 2016 and expect to be completed by the end of September.</p> <h3>How does this affect me?</h3><p>This feature is controlled in the SharePoint Online admin center and only affects OneDrive for Business. Once this feature has been rolled out to your organization, OneDrive for Business owners will begin receiving e-mail notifications when 1) another user shares one of the owner’s files to an external user (either a new external user or one who has been shared with before) and 2) when an external user accepts an invitation to the owner’s resource. These notifications contain information about the sharing & receiving users to help them make smart decisions about external access to their content. The notifications also provide easy access to revoke the shared with user’s access to the content.</p> <h3>What do I need to do to prepare for this change?</h3><p>This has administrative controls to enable and disable. This feature is on by default.</p>