Provide Access to Mailboxes in Remote Domains
By default, a new virtual server's root directory provides access to all mailboxes in the Exchange server's local domain. You can provide access to mailboxes in remote mail domains by creating a virtual directory for each remote domain.
Tip When you create a virtual directory to provide access to a mailbox, you do not have to identify a specific mailbox. You specify only a local domain or a remote SMTP domain. When a user accesses the virtual directory, Exchange attempts to access the mailbox associated with the Windows 2000 user account name that the user is logged on as. If you enabled anonymous access, the mailbox specified as the anonymous account is accessible to anonymous users.
To provide access to mailboxes in remote domains:
Tip The private mailbox is accessed through a URL that contains the user's logon account name.
For example, http://virtualserver/username, where virtualserver is the local or DNS name of the virtual server.