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Infrastructure Support – Office365 Administration


  • Limited documentation
  • Phased migration from on-prem to hybrid and then to cloud
  • Mailbox sizes during migration to cloud
  • 3rd party add-on integration failures during migration

Solution Approach:

  • Managing mailbox databases to accumulate storage by moving mailboxes when required
  • Installing update rollups and security updates for CAS, HUB, UM and mailbox servers
  • Rebooting Exchange servers to ensure equal system resource allocation for all the databases
  • Monitoring and verifying replication health and status for the mailbox servers in DAG using exchange management shell
  • Configured accepted domains, send connectors for the hybrid mail flow
  • Configured directory sync in staging mode
  • Planning mailbox migrations in phases considering various departments
  • Performing mailbox moves to office 365 and completing the move requests as scheduled
  • Configuring transport rules on office 365 to improve the tenant Microsoft Score
  • Manage recipients, Groups, resource mailboxes, shared mailboxes and active sync devices
  • Setup conditional access for Office 365 apps and Intune policies to manage ActiveSync devices
  • Enable auto expand archive quotas, archive mailboxes and Set up retention tags and retention policies

ATMECS Contribution:

  • Suggested and implemented disabling email forwarding option from the office 365 outlook web app options to improve security
  • Outlook settings such as safe senders list, auto download pictures for safe senders using GPO to increase usability
Infrastructure Support – Office365 Administration

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