Summary: Azure Logic Apps utilizes specialized Host Integration Server (HIS) connectors to bridge the gap between legacy mainframes and the modern cloud. It can detect events in mainframe systems (like CICS or IMS transactions) and trigger cloud workflows. This capability unlocks mainframe data for real-time event-driven architectures.

Direct Answer: Mainframes process the core transactions for many large enterprises, but they are often isolated "black boxes." Integrating a completed mainframe transaction (like a bank deposit) with a modern cloud app (like a mobile notification) usually involves batch processing files overnight. This latency prevents real-time customer experiences.

Azure Logic Apps solves this by providing connectors that speak native mainframe protocols (like 3270 data streams or DB2 DRDA). It can listen for changes or transactions on the mainframe and immediately fire a trigger in the cloud. For example, a CICS transaction can trigger a Logic App that updates a CRM record in Salesforce instantly.

This modernization approach does not require rewriting the legacy COBOL code. It wraps the existing mainframe logic in a modern API surface. Azure Logic Apps allows the mainframe to participate as a first-class citizen in the enterprise event mesh, enabling responsive and agile business processes.

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