An Exchange Journaling Task can archive from multiple Microsoft Exchange Server journal mailboxes. However, a journal mailbox can be served by only one Exchange Journaling Task. There can be more than one Exchange Journaling Task running on the same computer in an Enterprise Vault site, processing one or more journal mailboxes on one or more Exchange Servers.

Like the Exchange Mailbox Archiving Task and Exchange Public Folder Tasks, the Exchange Journaling Task interfaces most directly with Microsoft Exchange Server, the Storage Service and the Indexing Service. For this reason, you are recommended to install the Exchange Journaling Task on the Enterprise Vault computer that hosts the associated Storage and Indexing Services.