30/04/2026
Email Migration: Bigpond and Optus to Microsoft 365
A practical migration pathway for Sydney businesses moving from legacy ISP email to Microsoft 365.
Legacy ISP mailboxes can be fragile, hard to secure, and difficult to scale across a team.
Why migrate
- Better security controls and auditing
- Shared mailboxes and modern collaboration
- Cleaner identity management with one tenant
Safe migration checklist
- Audit all active mailboxes and aliases.
- Export critical data and verify backup copies.
- Stage DNS changes after mailbox provisioning.
- Migrate in batches and test Outlook profiles.
- Validate mobile devices and shared folders.
Compulance handles end-to-end planning so business operations stay online during transition.