With over 4 billion daily email users and the rise of online scheduling, integrating email, calendar, and contacts functionalities into applications is increasingly vital for enhancing productivity and gaining insights for personalized customer experiences. The choice between building these integrations in-house or using an external solution like Nylas depends on factors such as resource availability, product strategy, and total project costs. Nylas offers a unified API platform that simplifies the integration process with its comprehensive resources, including a sandbox environment, API documentation, and SDKs, allowing developers to either customize their solutions fully or use pre-built functionalities. Using Nylas can significantly speed up the time to market, as it handles maintenance, updates, and compliance with security standards like GDPR and HIPAA, ensuring stable and secure integrations. This approach reduces the need for dedicated integration engineers and helps companies manage costs effectively, allowing them to focus on core product features while maintaining control over user experience and integration quality.