If you need to change the default smtp send connectory port you can run the following command:

Set-SendConnector -Identity “Default” -port 26

Then you will need to restart the Microsoft Exchange Transport for the change to take effect.

This is the command to export the content from Tim?s mailbox to a folder name ?Tim? in Tom?s mailbox:

Export-Mailbox -Identity tim@example.com -TargetMailbox tom@example.com -TargetFolder tim