ASD's Blueprint for Secure Cloud

Mail Migration

This section describes the design decisions associated with Mail Migration for system(s) built using ASD's Blueprint for Secure Cloud.

Estimated reading time: 2 minutes

The implementation of Exchange Online can be coupled with a migration from the existing on-premises Exchange infrastructure. If a migration is not required, the deployment is referred to as a greenfield deployment of Exchange Online. There are three migration options:

  • Hybrid Migration – Often referred to as a staged migration, is where the on-premises Exchange environment is extended to Office 365 through departmental relationships or federation. During migration user mailboxes will be spread between the online and on-premises environments, this necessitates planning to ensure free/busy, calendar and mailbox sharing all continue to work.
  • Cutover Migration – A cutover migration is only recommended for organisations with less than 150 mailboxes and occurs over one or a few days. During this period email access may be unavailable. Prior to the migration event, a connection between the on-premises Exchange organisation and Exchange Online needs to be established.
  • PST Migration – A Personal Storage Table (PST) migration is where PST files with a mapping file are either shipped to or uploaded into Office 365. The Exchange Online instance is a greenfield deployment with no configuration required on the on-premises Exchange environment.

Cloud native deployments

Hybrid deployments

Security & Governance

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Acknowledgement of Country
We acknowledge the Traditional Owners and Custodians of Country throughout Australia and their continuing connections to land, sea and communities. We pay our respects to them, their cultures and their Elders; past, present and emerging. We also recognise Australia's First Peoples' enduring contribution to Australia's national security.

Authorised by the Australian Government, Canberra