Go-live
The moment a Dynamics 365 system goes into production use — when migrated data is loaded and users start posting real transactions.
Go-live is the moment a Dynamics 365 implementation stops being a project and becomes a production system. It is when migrated master data and opening balances are loaded, integrations are switched to live endpoints, the previous system is frozen or decommissioned, and users start posting real transactions. Go-live is preceded by user acceptance testing, a final data migration rehearsal, and a cutover plan that maps every step over a defined window. Most go-lives run with extra partner support for two to four weeks afterwards — known as hypercare — to handle questions and fixes before transitioning to steady-state support.