As part of our initial assessment phase which includes Data Collection and Analysis across the current infrastructure (regardless of version or type), we capture sizing & security information and also correlate the interdependencies such as EUC platforms, shared services (public folders, web services, SMTP relay etc.), device management tooling (MDM - current and future) as they ALL have an impact on the Planning & Design phase.

As with all cloud transformation projects Sundown execute, the preliminary information capture feeds into the Planning & Design phase, and underpins the Reference Architecture which documents subsequent build, migration and support plans.

All large-scale messaging transformations incorporate many of the key features and benefits listed below:


  • Preparing Office 365 to meet your organisations needs
  • Document Network Performance - capacity and bandwidth, security and firewall requirements
  • Offline Archive assessment and migrations / rehydration – PST’s etc.
  • Office 365 migration project rescue.
  • Licensing Assessment and recommendations
  • Decommissioning of on-premise infrastructure.
  • 24x7 Managed Services & HyperCare


  • Interoperability and co-existence across existing messaging environments and Office 365.
  • Directory replication with AAD Connect, if need be standby services, incorporating any writeback requirements.
  • Authentication whether Federated (via ADFS), pass-through authentication or password hash sync.
  • Multi-Factor requirements whether enforced through Conditional Access or though Federated ADFS with additional authentication rules or policies.
  • Mobile Device Management, device registration, profiles and tooling.
  • Global mail routing optimization and message hygiene.
  • Unified messaging migration.
  • Migration of all mail data including mailboxes, archives and public folders to Office 365.
  • New user provisioning can be orchestrated