Dynamics 365 Dual-write - Simply Explained

A salesperson updates a customer address in Dynamics 365 Sales. Later, someone in finance opens the same customer and still sees the old address. Which one is correct? When sales, service, finance, and operations work in different applications, shared business data can quickly become duplicated or inconsistent. In this episode of M365 FM, Mirko Peters explains how Dynamics 365 Dual-write connects Finance and Operations apps with Microsoft Dataverse so supported records such as customers, addresses, contacts, products, and orders can remain synchronized as teams work.

WHAT IS DYNAMICS 365 DUAL-WRITE?
Dual-write is Microsoft's built-in connection between Dynamics 365 Finance and Operations apps and Microsoft Dataverse. Think of an organization as having a front office and a back office. The front office includes salespeople, service agents, field workers, and other customer-facing teams. The back office handles finance, inventory, purchasing, orders, fulfillment, and other operational processes. Both sides work with many of the same customers and products, but they need different applications for their jobs. Dual-write creates a controlled connection between those environments so selected shared records can remain synchronized without employees manually copying information between applications.

THE BUSINESS PROBLEM DUAL-WRITE SOLVES
Without integration, one customer can quietly become two different records. Sales might have Northwind Bikes with the customer's new address. Finance might have Northwind Bicycle Company with the previous address. Both records can look correct when viewed independently, but they no longer describe exactly the same business relationship. Employees then become the integration layer. They export spreadsheets, send emails, compare records, re-enter information, and investigate which version is correct. Dual-write is designed to reduce that manual handoff.

FRONT OFFICE AND BACK OFFICE
Dynamics 365 applications support different types of work. Dynamics 365 Sales focuses on leads, opportunities, customer relationships, and sales conversations. Customer Service manages customer questions and cases. Field Service supports technicians and work performed at customer locations. Finance and Supply Chain Management handle areas such as accounting, inventory, products, purchasing, orders, and fulfillment. The objective isn't to force every employee into one giant application. Instead, employees continue using the application appropriate for their role while selected business information remains connected behind the scenes.

MICROSOFT DATAVERSE
Dataverse is the shared data foundation behind many Microsoft business applications. Dynamics 365 Sales, Customer Service, Field Service, parts of Project Operations, Power Apps, and Power Automate can work with Dataverse. For understanding Dual-write, think of Dataverse as the common data area on the customer-application side. Finance and Operations remains the operational foundation on the other side. Dual-write connects selected records between these environments.

THINK OF DUAL-WRITE AS AN INTERNAL DOOR
Imagine an office building with customer-facing teams on one side and finance and operations on the other. Without integration, somebody has to carry information between them. They might send an email, move a spreadsheet, or manually enter the information again. Dual-write acts like a staffed internal door. When a supported record changes on one side, Dual-write can pass the related change through that door according to predefined rules. Each team keeps its own workspace while shared information remains connected.

WHAT ARE TABLE MAPS?
Dual-write doesn't blindly synchronize every piece of information. It works through defined connections called table maps. A table stores a particular type of record. A customer table contains customer records. A product table contains products....