Exchange Online Reduces Delicensing Resiliency Threshold to 5,000 Mailboxes

A July 15 announcement says that Exchange Online is reducing the Delicensing Resiliency threshold from 10,000 to 5,000 mailboxes. That’s fine, but this feature should be available for all Exchange Online tenants. It’s a sticking plaster for how group-based licensing works and is inconsistent with how OneDrive for Business deals with unlicensed personal user data.

https://office365itpros.com/2025/07/16/delicensing-resiliency-5000/