asked on
The one which was copied might have the same name i.e. "Mailbox Database" and the blank mount one also has the same name i.e. "Mailbox Database", so i don't think a rename is required.
Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.
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Copy existing database on new server with logs
check database if it in clean state, if not soft repair it and get it in clean shutdown state
Now rename that database to same name as new one
Dismount the new database, and replace new database file with old one and mount database again
steps to repair database
https://megabite.nl/kb/using-eseutil-to-recover-and-repair-exchange-databases/