When a mailbox is first created it inherits the OWA and Service Access (POP/SMTP/IMAP) from the service plan assigned to exchange organization. In some cased you may want to change service features for individual mailboxes. You may do this easily via web interface.
To change storage & mailbox quotas navigate to the following path:
Click on the Service Management link and then select Mail Boxes tab. Click on the mailbox name for which you wish manage the service features. Now, click on the Advanced tabs to set various OWA and POP/IMAP/SMTP options.
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