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Article ID: 2269810 - Last Review: August 19, 2010 - Revision: 2.0


This article contains information about Microsoft’s support policy regarding Single Label Domains (SLDs). SLDs are DNS names that do not contain a suffix, such as .com, .corp, .net, or .org. For example, contoso would be an SLD. However,,, or contoso.local would not be an SLD.


Although an SLD is not a common configuration worldwide, some Microsoft products can be installed in an SLD configuration and in other uncommon namespace configurations. However, certain considerations may apply, as noted by individual product groups. Existing products may continue to function with SLDs, but SLDs are not a recommended configuration for future deployments and may not work with some products or versions. Other Microsoft or third-party applications that end-users may want to run in your environment may not be compatible on an SLD. We recommend that customers deploy their infrastructure by using common, tested configurations to minimize extra deployment and testing costs.

The Microsoft Common Engineering Criteria ( program establishes a set of engineering requirements across all Microsoft server products ( . The Microsoft Common Engineering Criteria program continues to evaluate the development guidelines for various naming configurations, including guidelines on namespace topology, in our Microsoft server products.

Microsoft remains committed to evaluating any technical issues that customers experience with SLD. Microsoft encourages customers to examine their SLD configuration and issues to determine whether migration to a fully qualified domain name (FQDN) is necessary.

Microsoft will continue to provide commercially reasonable support to customers who have existing SLD configurations, subject to the terms of the Microsoft Support Lifecycle policy ( and their Microsoft support agreement. This clarification of the support policy means that Microsoft Premier Support customers who have SLD configurations can contact Microsoft Customer Service and Support (CSS) per their Premier Support agreement to report problems or issues. Their support requests will be carefully evaluated by CSS or by the respective product groups.


DNS Namespace Planning Solution Center (

  • Windows Server 2008 R2 Datacenter
  • Windows Server 2008 R2 Enterprise
  • Windows Server 2008 R2 Foundation
  • Windows Server 2008 R2 Standard
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