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This article shows you step by step how to create a "Postmaster" in Active Directory / Microsoft Exchange Server that is capable of accessing the mailboxes (and hence the calendars, free/busy information) of all/selected Active Directory users.

Sometimes you may find that your site needs to be innaccessible for a short period of time whilst updates are performed, such as updates to user logins. This should not be allowed whilst the site is being edited, but you may need to be able to check the site yourself during this update. Here's how to block others, except yourself during these periods.