resource mailboxes

Resource mailboxes in Exchange Online, including room, equipment, and workspace mailboxes, lack a native utilization report from Microsoft. Administrators must use PowerShell, Microsoft Graph, or mailbox folder statistics to determine which resource mailboxes are actively used. This gap affects facilities planning, hybrid work policies, and cost control, as organizations rely on calendar data to infer usage. The threads discuss how IT teams can audit resource mailbox activity by assembling evidence from APIs rather than relying on a built-in report.