The Exchange Server 2007 SP1 Help can help you in the day-to-day administration of Exchange. Use this information to guide you through Exchange Server 2007 SP1 features, tasks, and administration procedures.
You can download it here: http://www.microsoft.com/downloads/details.aspx?familyid=5eb0f9a0-2c49-4f2a-8a09-b981ed667821&displaylang=en&tm
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