A company has a legacy monolithic application running on an on-premises Windows Server 2008 R2 virtual machine.

The application code is lost, and it cannot be modified or recompiled. The company wants to move this application to Azure to close their on-premises datacenter. They want to minimize the effort and risk of the migration.

Which migration strategy (from the 7 R's) should you recommend?

Rehosting (often called Lift and Shift) involves moving the application and its underlying operating system to Azure Virtual Machines (IaaS) without making any changes to the application architecture or code. Because the source code is lost and cannot be modified, Rehosting using Azure Migrate is the only viable strategy that minimizes effort and risk. Azure also provides Extended Security Updates for legacy OSs like Windows Server 2008 R2 when hosted in Azure.