In Exchange server 2019 and Exchange server 2016, the mailbox service is the back-end part of an Exchange server. Its primary role is to host mailboxes, but the Transport service and Client Access service (not to confuse with Client Access Front-End services) are also part of the Mailbox service. From an architectural point of view, it is very much comparable with the old Exchange server 2013 Mailbox ...
4. Exchange 2019 Mailbox Services
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