A Microsoft 365 migration fails for predictable reasons: cutting over everyone at once, skipping mail-flow verification, and underestimating the change-management side.
A calm approach is phased:
- Inventory your users, domains, and shared mailboxes.
- Verify mail flow with a small pilot group before touching anyone else.
- Migrate by cohort, starting with the least disruptive group.
- Train before you cut over — the helpdesk spike comes from confusion, not bugs.
The technology is the easy part. The calm, phased rollout is what keeps your team working while it happens.
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