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How long will older versions of the AdWords API WSDL be available?

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Once a version of the WSDL has been replaced by an updated version, the older version will be supported for four months to allow time for users to migrate to the newer version. During this period, AdWords API will continue to provide developer access to and support for any version dating back four months. Version-related documentation can be found in the Release Notes and Reference sections of the AdWords API Developer's Guide.

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