Cutover
The structured sequence of activities that transitions from legacy systems to a new Dynamics 365 environment at go-live.
Cutover is the structured sequence of activities that transitions a customer from legacy systems to Dynamics 365 at go-live. A typical cutover plan covers: final data extract from the legacy system, transformation, load into Dynamics 365, reconciliation to the penny against expected balances, integration endpoint switchover from test to live, user account activation, and the formal cut moment where the legacy system goes read-only and the new system accepts production transactions. Mature implementations run a mock cutover (a complete dry-run, often a month before go-live) and a real cutover (the actual event, usually over a weekend or holiday). A detailed minute-by-minute cutover runbook is one of the most important pre-go-live deliverables.