I setup Exchange server 2013 

when go to the url (http://192.168.1.10/ecp)

in mailbox 

show user mail box and don't show linked mail box 

in resources don't show icon new 

what is this the problem please 

Hi,

Please use https://localhost/ecp URL to check this issue.

Please switch to other browsers to check this issue and make sure IE is the latest version.

Please run the following command to find all the linked mailboxes in the organization .

Get-Mailbox -ResultSize unlimited -Filter {(RecipientTypeDetails -eq 'LinkedMailbox')}

Best Regards.