To add a linked mailbox navigate to the following path:
Click on the Service Management link and then select Mail Boxes tab. Click on the Add new mailbox button to add a new mailbox.
Mail-enable active directory user: Select the Existing user or create the new one.
Mailbox database: Select Mailbox Database from the drop down list
Mailbox Size (in MB): Provide mailbox size in MB.
Full Name (Display name): Provide the display name of the mailbox.
Primary email: Provide email address for the account.
Mailbox type: Select mailbox type Linked Mailbox.
Linked domain controller: Select a domain controller in the account forest. Exchange will connect to this domain controller to retrieve the list of user accounts in the account forest so that you can select the linked master account.
Linked master account: Select a user account in the account forest, and then click OK. The new linked mailbox will be associated with this account.
Linked domain administrator login: Provide Administrator login.
Linked domain administrator password: Provide password.
Confirm password: Retype password.
Hide from Exchange Address Lists: Check this option if you want to hide it from the exchange address list.
Click on the Add Mail Box button when done.
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