Set up Calendar Interop

Decide whether to use a domain alias

You need to consider whether your setup requires a G Suite domain alias. If it does, you need to complete additional steps to use the domain alias with Calendar Interop.

When do I need to use a domain alias? 

You need to use an alias if your Microsoft Exchange and G Suite users have overlapping email addresses (for example, the email domain is for both G Suite and Exchange users). Exchange decides where to direct availability requests based on the domain name. There is a conflict if the domain name used on Exchange for G Suite users is the same as the domain used by Exchange users. You should use a domain alias to ensure the availability address space points to G Suite, not Exchange.

  • If you need to use a domain alias, complete the setup steps below.
  • If you aren't using a domain alias, proceed to the next step

Use a domain alias with Calendar Interop

  1. Set up your domain alias. Make sure that the alias domain name you choose doesn't match the email domain used by your Exchange users. For details, see Add more domains to your G Suite account.
  2. Make sure you set up the alias domain's MX records in the DNS settings. For details, see Set up MX records for G Suite and Gmail.
  3. Send a test message from your Exchange server to a user’s alias address to verify that mail is going to the alias address.
  4. Go to the Next steps and follow the setup instructions for Calendar Interop. Make sure you use the alias domain in the following situations:
    1. When setting up mail contacts for a G Suite user on Exchange—The contact's primary email address (the address shown in bold text in Exchange) should be on the alias domain. For details, see Set up your G Suite users.

      Note: You can add the original Exchange email address of the contact as an additional SMTP address for the contact.

    2. When adding a new availability space in Exchange—Use the alias domain when prompted in the configuration tool. For details, see Add an availability address space to Exchange.

Next steps

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