This article, "How to Plan a Large-Scale On-Premises Exchange-to-Microsoft 365 Mailbox Migration for Minimal Business Disruption," was originally published at https://www.blogthetech.com/plan-large-scale-exchange-to-microsoft-365-migration-minimal-disruption/. If you are reading it anywhere else, it was copied without permission.
Archive sizing, licensing, and a reversible pilot batch decide whether a large Exchange migration lands well. This guide gives the criteria, prerequisites, ordered procedure, and verification gates for minimal business disruption across primary, archive, and shared mailboxes.
