Exchange 2013 System mailboxes

Exchange 2013 System mailboxes

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System mailboxes are created by Exchange in the root domain of the Active Directory forest during installation. Users or administrators can’t sign in to these mailboxes. System mailboxes are created for Exchange features such as Unified Messaging (UM), migration, message approval, and In-Place eDiscovery. This table lists information about system mailboxes as they’re displayed in Active Directory.

Organization Mailbox

SystemMailbox {bb558c35-97f1-4cb9-8ff7-d53741dc928c}

Message approval Mailbox

SystemMailbox {1f05a927-xxxx- xxxx – xxxx -xxxxxxxxxxxx}

where x is a randomly assigned and unique number for each Exchange forest

UM data storage Mailbox

SystemMailbox {e0dc1c29-89c3-4034-b678-e6c29d823ed9}

Discovery Mailbox

DiscoverySearchMailbox {D919BA05-46A6-415f-80AD-7E09334BB852}

Federated email Mailbox

FederatedEmail.4c1f4d8b-8179-4148-93bf-00a95fa1e042

Migration Mailbox 

Migration.8f3e7716-2011-43e4-96b1-aba62d229136

If you want to decommission the last Mailbox server in your Exchange organization, you should first disable these system mailboxes by using the Disable-Mailbox cmdlet. When you decommission a Mailbox server that contains these system mailboxes, you should move the system mailboxes to another Mailbox server to make sure that you don’t lose functionality.

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