Action: Add mail enabled users to Exchange Online - Before data migration to Office 365, G Suite mailboxes first need to ...

Action: Add mail enabled users to Exchange Online - Before data migration to Office 365, G Suite mailboxes first need to be represented as mail-enabled users (contacts) in Exchange Online to support co-existence mail flow. When you enable directory synchronization, you can also mail-enable an Active Directory user account by running the Windows PowerShell cmdlet enable-mailuser from the on-premises Exchange Server. After the next directory synchronization completes, confirm the objects appears as contacts in Exchange Online. When ready to begin data migration, assign each user an Exchange Online license and set the auto-forwarding on the Office 365 mailbox to point to the MX record routing domain (for example, pilot.contoso.com) which should point to G Suite. The FastTrack team can then begin backfill replication during the initial sync. The initial sync includes all old emails (not including emails between 30-60 days old) and can be scheduled T-21 days in advance of the planned cutover. The second pass controls the cutover date and time and includes email and calendar items between 30-60 days old. The migration team disables auto-forwarding on the Office 365 mailbox after the second cutover pass completes.  They also set G Suite auto-forwarding to point to Office 365. Contact your FastTrack team for more information.