In the blog post "Moving from SQL Server to Couchbase Part 3: App Migration," the author discusses the transition from Microsoft SQL Server to Couchbase Server, emphasizing considerations for application migration. While Couchbase offers advantages like flexible data modeling and fast data access, the transition may require significant application restructuring depending on the existing architecture's coupling with the database. The post highlights the similarities between SQL and N1QL, Couchbase's query language, and suggests using a service tier to replace stored procedures and triggers, which are not directly supported in Couchbase. It also reviews key changes in application coding, including serialization, security, and concurrency in Couchbase, as well as the use of ODMs (Object Document Models) in place of OR/Ms (Object-Relational Mappers) for managing data models. Additionally, the potential benefits of using Couchbase with Kafka, Spark, and Hadoop for data processing and analytics are mentioned, along with a call for feedback to improve the transition process.