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Once you have successfully installed Exchange Server 2019, you must prepare it to work as your primary email server. Before you migrate mailboxes from Exchange 2016 to 2019, multiple configurations are required to create a suitable environment for mailboxes, both new and old. Let’s check various roles and other requirements that you should install.
Exchange 2016 to 2019 Migration Guides
The mailbox server role will host the user mailboxes and public folders, operate Outlook on the Web, and generate Offline Address Book. Meanwhile, Edge Transport Server Role secures the mailbox by anti-spam filtering and creates message policies for incoming/outgoing messages. You can enable both roles while installing the Exchange Server.
On the new Server, it is advisable to create an administrative mailbox and add it to the Organization Management Server Role Group. You will use this mailbox when you require permission to start the migration from Exchange Server 2016 to 2019.
Before migrating public folders from older versions of Exchange, you should create a public folder mailbox in Exchange 2019. It will save the entire public folder hierarchy without requiring a public folder database (unlike the older versions of Exchange).
Multiple Exchange client services (Outlook Anywhere and Exchange ActiveSync) require some certificates to run effectively. If you have an existing TCS certificate, you can add it to the new Exchange by changing the host names or buying a new one from a third-party vendor.
Arbitration mailboxes save organizational details like administrator audit logs, metadata for eDiscovery searches, etc. You should migrate these mailboxes before user mailboxes as Exchange 2019 will not log the administrator audits cmdlet activities. The eDiscovery searches will be queued but won’t start.
After configuring Exchange 2019 server and mailboxes, it’s time to update the DNS records. You should direct the DNS connections towards Exchange 2019. The host names will be transferred from Outlook on the Web, Autodiscover, etc., from Exchange Server 2016 to 2019.
When the user opens their mailboxes before the migration, Exchange Server 2019 will request a proxy connection and connect with the legacy Exchange Server hosting the mailbox. It has two steps-
After completing the configuration of Exchange 2019, you can migrate your primary mailboxes from the older Exchange version to here. You will use your Exchange Admin Center to create a migration batch that syncs the mailboxes and migrates mailbox folders.