The Search-MailboxAuditLog and New-MailboxAuditLogSearch cmdlets will retire by December 2025. After March 1, 2025, mailbox audit logs become read-only. Organizations must transition to the Search-UnifiedAuditLog cmdlet for audit access, with migration support available from June 2025.
Applies to: Exchange Online
Source: mc.merill.net — data via Merill Fernando's open archive (MIT).