Domain Level Administrators can override the quota setting If the mailbox is set to use the default size quota (set in the domain). Then the user with domain privileges can override the quota. If you do not want to allow domain admins privilege to modify domain quotas, you can modify the Remote web console files which you can simply remove the quota field or make it invisible to the domain privileged user so only the Server level privileged user can make those changes. If you are working on a clustered server be sure to copy the template files from the MailSite\Templates\ folder into the root of the BOX directory and make your changes to those files. For further information on how to customize the Web console turn to Appendix D "Customization Web Console".