Since a couple of days Office 365 customers are reporting that they notice a new SPO address type appearing at some of their user’s mailboxes.
The SPO initialism indicates the new address type is related to SharePoint Online features, the fact that it only appears on objects with a SharePoint Online license confirms this.
At this time there’s no public documentation that describes the function of this new addresses. If you happen to know more, please leave a comment.
