Before any content moved, I built 15 Group Policy objects to manage the migration from file shares to Azure Files. Having the infrastructure layer in place first is what I got right.

Two other things worked:

• MigrationWiz’s pre-migration endpoint verification caught permission gaps and authentication issues that would have shown up as item-level errors in the first batch.
• The mailbox batching structure kept EWS throttling under control.

What I’d change is communication after cutover. The issues in six client environments weren’t random, and the delta-pass migration logs showed they were predictable. I had the data. I had no organized process for turning it into a warning to the support teams at those sites before users started calling. If I’d built that step into the hypercare plan before cutover, I believe escalations in the first 72 hours would have dropped.

Supporting the aftermath across a distributed client base taught me the common failure patterns, a triage approach that scaled across regions, and how to spot MigrationWiz errors that point to source environment configuration instead of tool behavior.

The 200-mailbox project was the field training that made every enterprise migration I ran afterward faster and better documented.

Looking at your last large MigrationWiz project, what did the logs tell you that you didn’t act on in time?

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