Creating shared mailboxes on Office365 / Exchange online hybrids

Creating shared mailboxes on Office365 / Exchange online hybrids

Create a AD object and then enable a remote mailbox from On-Prem

  • Open Active Directory users and computers console. 
  • Navigate to the desired OU (remember that the OU should be Synced to Office365)
  • Right Click on the OU to create a New user.
  • Complete the user details in the New Object dialog box and click on finish.
  • Open exchange management powershell on the Hybrid servers and run the below command to enable a remote mailbox for the user.
Enable-RemoteMailbox -Identity "useralias@domain.com" -primarysmtpaddress "useralias@domain.com" -RemoteRoutingAddress "useralias@tenant.mail.onmicrosoft.com"

If you need Archive to be enabled, run the below command as well.

Enable-RemoteMailbox -Identity "useralias@domain.com" -Archive

  • Please add "smpt:useralias@tenant.mail.onmicrosoft.com" to proxyaddress list to avoid mail flow issues.
  • Wait for the object to Sync
  • We would be able to search for the user in Office365 Admin console once the sync is completed.
  • We would be searching for the mailbox in user mailboxes list as the mailbox type is not yet set.
  • At this step rather than assigning license we could be converting the mailbox to shared. follow the link and complete the mailbox setup. 

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