First published on MSDN on Sep 21, 2018
Authored by npatel@microsoft.com
Azure Database Migration Service now supports migrations from MongoDB to Azure Cosmos DB MongoDB API. You can sign up for this preview capability here .
Azure Cosmos DB is Microsoft's globally distributed, multi-model database service for mission-critical applications. Azure Cosmos DB provides turn-key global distribution, elastic scaling of throughput and storage worldwide, single-digit millisecond latencies at the 99th percentile, and guaranteed high availability, all backed by industry-leading SLAs. Azure Cosmos DB automatically indexes data without requiring you to deal with schema and index management. It is multi-model and supports document, key-value, graph, and columnar data models. 
Azure Cosmos DB databases can be used as the data store for apps written for MongoDB. This functionality means that by using existing drivers, your application written for MongoDB can now communicate with Azure Cosmos DB and use Azure Cosmos DB databases instead of MongoDB databases. In many cases, you can switch from using MongoDB to Azure Cosmos DB by simply changing a connection string. Using this functionality, you can easily build and run MongoDB globally distributed database applications in the Azure cloud with Azure Cosmos DB and its comprehensive industry-leading SLAs while continuing to use familiar skills and tools for MongoDB.
Azure Database Migration Service makes moving MongoDB to Azure Cosmos DB MongoDB API a reliable, seamless and frictionless experience. It's as easy as selecting a source and target and letting the service do the heavy lifting of migration. 
You can sign up for this preview capability here .
More Information about Azure Database Migration Service
More information about Azure Cosmos DB MongoAPI