Larger organizations typically have customer information in multiple systems. In fact, it seems as though, as an organization grows, their sources of customer information grow too. With multiple sources of customer information, it is difficult to arrive at “one version of the truth” regarding what an enterprise is doing with a particular customer. Many enterprises have recognized this problem and attempted to address it with data warehousing, data marts, operational data stores or an enterprise integration bus. Building a ubiquitous Customer Hub to merge and manage customer master data across numerous applications is different than each of these strategies. Successful deployment of Microsoft CRM requires that an enterprise address the problem of Customer Data Integration. This does not mean that an enterprise must first deploy a Customer Hub. However, understanding the multiple sources of customer data and putting a strategy in place to address data de-duplication and on- going data hygiene provides the foundation for a successful deployment of Microsoft CRM.