inactive mailboxes

Inactive mailboxes in Exchange Online are mailboxes placed on Litigation Hold or assigned to a retention policy that have been soft-deleted but retain their data for compliance or eDiscovery purposes. Managing these mailboxes safely is critical, as they can hold sensitive information subject to legal holds. A key PowerShell command, Set-Mailbox -ExcludeFromAllHolds, allows administrators to remove most retention holds from inactive mailboxes in a single operation, but it must be used with caution to avoid inadvertently releasing data under legal or restrictive holds. Microsoft Purview provides a centralized platform for managing legal holds and eDiscovery, but relying solely on it can introduce risks in high-stakes scenarios. Proper auditing and verification are essential when handling inactive mailboxes.