Merge pull request #270918 from nicjohn79/patch-22

Update hdinsight-overview-before-you-start.md

Author: v-dirichards

articles/hdinsight/hdinsight-overview-before-you-start.md

@@ -29,7 +29,21 @@ As part of the best practices, we recommend you keep your clusters updated on re
 
 HDInsight release happens every 30 to 60 days. It's always good to move to the latest release as early possible. The recommended maximum duration for cluster upgrades is less than six months.
 
-For more information, see how to [Migrate HDInsight cluster to a newer version](./hdinsight-upgrade-cluster.md)
+For more information, see how to [Migrate HDInsight cluster to a newer version](./hdinsight-upgrade-cluster.md).
+
+## Integrating Third-party applications
+
+Microsoft will only support machines that are created by the HDInsight service (for example, HDInsight clusters, edge nodes, and worker nodes). We don't support third-party client machines or moving the HDInsight libraries from a supported machine to an external machine. 
+
+While this third-party integration may work for some time, it is not recommended in production environments because the scenario isn't supported. 
+
+When you open a support request for an unsupported scenario, you'll be asked to ***reproduce the problem in a supported scenario*** so we can investigate. Any fixes provided would be for the supported scenario only. 
+
+### Supported ways to integrate third party applications
+
+* [Install HDInsight applications](hdinsight-apps-install-applications.md): Learn how to install an HDInsight application to your clusters.
+* [Install custom HDInsight applications](hdinsight-apps-install-custom-applications.md): learn how to deploy an unpublished HDInsight application to HDInsight.
+* [Publish HDInsight applications](hdinsight-apps-publish-applications.md): Learn how to publish your custom HDInsight applications to Azure Marketplace.
 
 ## Next steps