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Can I delete inactive accounts that were created by the Exchange Server 2013 installation proccess

Exchange Server 2013 created accounts such as "SystemMailbox bb558c35-97f1-4cb9-8ff7-d53741dc928c" during the installation process but they are now marked inactive. Can I safely delete these accounts from Active Directory?
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2 Solutions
Randy DownsOWNERCommented:
If you don't know recognize them the safest thing is to keep them.

Maybe this will help

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.
Lior KarasentiCommented:
I strongly suggest that you don't delete this mailbox. read here:

SystemMailbox{bb558c35-97f1-4cb9-8ff7-d53741dc928c}: This mailbox, new in Exchange 2013, is used in the Offline Address Book (OAB) generation process. This Arbitration Mailbox with persisted capability "OrganizationCapabilityOABGen" is called an Organization Mailbox.

You can read more about system mailboxes here:

Adub65Author Commented:
Randy DownsOWNERCommented:
I think the proper answer was given and advice taken which is "don't delete the accounts"
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