Before you can connect to your new server from the Internet, you need to configure the external domains, or URLs, on the Mailbox server’s virtual directories and then configure your public domain name service (DNS) records. The steps below configure the same external domain on the external URL of each virtual directory. If you want to configure different external domains on one or more virtual directory external URLs, you need to configure the external URLs manually. For more information, see Virtual directory management.
|Virtual directory||External URL value|
|Autodiscover||No external URL displayed|
If you already have items on Virtual Directories, go directly to the alternate steps
Some organizations make the Outlook Web App FQDN unique to protect users against changes to underlying server FQDN changes. Many organizations use owa.contoso.com for their Outlook Web App FQDN instead of mail.contoso.com. If you want to configure a unique Outlook Web App FQDN, do the following after you completed the previous step. This checklist assumes you have configured a unique Outlook Web App FQDN.
Should you have one, click here