When a mailbox is first created it inherits the storage and mail quotas from the service plan assigned to exchange organization. In some cased you may want to change storage & mail quotas 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 storage and mailbox quota. Now, click on Mail Flow Settings and Advanced tabs to manage various storage and mail quota options.
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