Microsoft changes plan to charge for Office 365 Inactive Mailboxes, for now.
Tony Redmond posted an article that explained Microsoft’s current thinking on Inactive Mailboxes. Inactive mailboxes are critical for data retention for former employees and shared resources so that they can be accessed later if needed. It is understandable that some cost should be associated with these mailboxes, so I suspect that in the future we’ll see another license type that will cover the cost of these infrequently accessed mailboxes.
If you want to automate the conversion of User Mailboxes to Shared Mailboxes and/or automatically revoke licenses during user processioning, Cayosoft Administrator is the answer.