This article covers how to move Exchange Mailboxes to Another Database.
Exchange administrator can move user mailboxes in the Active Directory forest from one database to another between Exchange servers, or between mailbox databases on the same server through the Exchange Admin Center web interface or PowerShell CLI.
To move the user or resource mailbox from one database to another, you need to create a move request (if migration occurs within the same Active Directory forest, this is called a local move request; if you want to move a mailbox between AD forests — this is a remote move request).
To move the user mailbox the New-MoveRequest cmdlet is used.
The following two services process your move request to move mailboxes:
1. Exchange Mailbox Replication service (MRS)
2. Exchange Mailbox Replication Proxy
How to Create local move requests ?
You can create local move requests for:
1. A single mailbox.
2. Multiple mailboxes (also known as a batch move request).
3. Multiple mailboxes that you specify in a comma-separated value (CSV) file (also known as a migration batch).