Do you manage M365 migrations, but not the on-premises infrastructure that these workloads leave behind?

I worked as a Systems Engineer for six years, managing over 1,600 Windows Servers in multiple datacenters. I never ran a mailbox-migration. Windows Server versions 2003 to 2016. VMware vSphere can be built from ISO images. WSUS patching across enterprise infrastructure, where a missed update cycle could create a security vulnerability across hundreds of production servers.

This background did not slow down my progress when I switched to migration engineering. It made me more proficient than engineers who started with cloud-native environments, then worked backwards.

The PowerShell automation from that time, scripting SCCM/SCEP deployments on 1,600 servers, forms the basis of the scripting expertise that M365 migration specialist roles require to manage mailboxes, directory items, and distribution groups in a scalable manner. You don’t develop that skill by running portal-based operation one record at a. You develop it when you need to automate, because the alternative isn’t viable.

The VMware vSphere project from that time is the basis for the physical-to cloud lift judgment required by Azure migration. Migrating 100 or more physical and virtual servers using the Azure Migrate Tool requires a different approach than migrating cloud native workloads. To make the right decisions about dependency mapping, storage configuration and network connectivity, which determine whether a lifted work load performs correctly in Azure, you need to understand what it was doing before it moved.

Patch sequencing and rollback plans across 1,600 servers created the discipline required for migration runbook design. The same questions arise: what is a good order of operations? What is a rollback trigger? And who has the authority to make independent decisions.

Engineers who are familiar with on-premises infrastructure know why hybrid identity configurations can be fragile in a way that cloud-native engineering has not yet had the time to learn. This perspective gives engineers a competitive edge in migration work.

What on-premises experience informs your cloud migration judgement today?

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