The technical plan was solid. Environment assessed, dependencies mapped, tools staged, cutover window confirmed.

What wasn’t in the plan was a shared email address nobody had documented. Not in IT’s files, not on the migration checklist, not surfaced during discovery.

It showed up the morning after cutover when someone couldn’t access a service they had used for three years.

This happens on almost every migration. Not because the team was careless, but because environments accumulate things over time that never make it into formal documentation. Shadow configurations. Informal workarounds. Access set up by someone who left two years ago.

The lesson isn’t to plan harder. Some things won’t surface until a real user hits them in a live environment. Hyper Care exists for exactly that reason. It’s where you find what the plan didn’t know about and fix it before it compounds.

Every migration has a clean cutover. Not every migration has a clean week after.

What’s the thing that surfaced post-cutover that your plan had no way of anticipating?

#Migration #M365Migration #IT