When performing the installation of Archiver the system attempts to connect to the SQL database back end that will be the storage for email data. During this operation the Database Server field is not populated and is the drop down is empty.
Administrators performing the install notice they cannot get SQL to connect. When the database drop down is empty and does not auto-populate this is usually an indication of a communication issue or service failure.
The SQL Server Browser service needs to be started/restarted to resolve the error:
Open the Windows Services Manager by typing
services.mscon the Windows Run dialog ( press Windows key + R):
Locate the SQL Server Browser service.
Start the service (if it is not running) or restart the service (if it is currently running):
Verify that the SQL Server name is correct.
Select Ok on the Database Configuration panel.
The installation or upgrade should proceed without encountering the error/prompt mentioned above.