Never
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MCPD certifications will not be updated for versions later than Visual Studio 2010, and your MCPD certification will decline in value as companies move to newer versions of our products. http://www.microsoft.com/learning/en/us/mcpd-certification.aspx#fbid=fl9AfLKIl_Q
All MCPD certifications are expected to be retired by July 2014
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MCPD certifications will not be updated for versions later than Visual Studio 2010, and your MCPD certification will decline in value as companies move to newer versions of our products.
http://www.microsoft.com/learning/en/us/mcpd-certification.aspx#fbid=fl9AfLKIl_Q
All MCPD certifications are expected to be retired by July 2014
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was replaced with Microsoft Certified Solutions Developer (MCSD)
http://www.microsoft.com/learning/en/us/mcsd-certification.aspx#fbid=fl9AfLKIl_Q