Project guide · Microsoft 365
Migrating email and files to Microsoft 365 with governance from day one
A staged migration with ownership, access and recovery built into the launch requirements.
Starting point
What brings the project forward
A company is moving from hosted email, local file shares and ad hoc cloud storage. Information responsibility is inconsistent and several external collaborators use shared credentials or broad links.
Constraints
- Move without disrupting customer communication
- Avoid carrying unmanaged access into the new tenant
- Create usable collaboration structures
- Retire legacy services safely
- Give users a clear support path during each wave
A workable delivery sequence
- 01
Discovery and ownership
Inventory domains, identities, mail flow, data, permissions, delegates, devices, applications and business owners.
- 02
Destination design
Approve identity, Teams and SharePoint structures, guest access, naming, lifecycle, retention, recovery and support.
- 03
Pilot
Move a mix of users and difficult data, then reconcile counts, permissions, mail, devices and daily work.
- 04
Wave and close
Migrate in controlled waves, support users, validate each group and retire legacy access after acceptance.
- 05
Stabilise ownership
Resolve migration exceptions, transfer runbooks and administration, and review demand before closing the project.
Destination
Identity, mail, files and collaboration operate in a governed Microsoft 365 tenant with named owners, appropriate access, protected administration, tested migration reconciliation and a documented recovery and support model.
Business decisions
- What data is cleaned, archived or migrated
- Who owns sites and groups
- External sharing model
- Coexistence, rollback and decommission thresholds
Tests before go-live
- Mail flow and identity work for pilot and production users
- Sampled data and permissions reconcile
- Governance owners can operate lifecycle tasks
- Legacy access is closed only after approved validation
Handover material
- Migration and governance design
- Pilot and reconciliation record
- Wave runbook
- Administrator and user handover