Microsoft Active Directory fosters great trepidation and fears within the business community. Many companies do not know how, or feel they are able to test their Active Directory regularly. Many have reported a lack of good resources and tools. While these companies feel that AD presents a great challenge to them, they also find that downtime due to Active Directory issues can cost their productivity greatly with estimates from some companies in the range of $50,000 to $100,000 per hour.
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http://www.channelinsider.com/tech-analysis/slideshows/defining-the-microsoft-active-directory-opportunity.html/