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Configure G Suite for classic Calendar Interop

From February 28, 2018, the classic Calendar Interop tool will not be available. You can use the new Calendar Interop tool instead. Learn about the new Calendar Interop tool.

To complete your classic Calendar Interop configuration, follow these steps:

1. Configure classic Calendar interop settings
  1. Click G Suite > Calendar > Calendar interop management.
    Where is it?
  2. In the Exchange Web Services url text box, enter the Exchange Web Services URL for the Exchange Web Services server associated with your Microsoft® Exchange server. For example:

  3. In the Admin account text box, enter the Exchange server role account UPN (User Principal Name). Enter the username in format (not in domain\username or username format). Click Enter password and enter the password for the role account.

  4. Click the Enable Server Version of Free Busy Sync check box.

  5. Click Save changes.

2. Add Interop users
  1. Click the Users tab to enter the list of G Suite users whose f/b data you'd like to sync to Exchange.

  2. Enter a list of Exchange mail-enabled contacts (created in step #4 of the Exchange configuration) for G Suite users, along with their legacyExchangeDN attribute value in CSV format. Enter one email address per line, and use the full email address, including the domain name, such as

    Here's an example:,GOOGLE, /o=First Organization/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=jsmith,GOOGLE, /o=First Organization/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=bjones,GOOGLE,"/o=First Organization/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=Michael, Wise"

    It might take up to two hours for the sync to happen for the added users.
Why use the legacyExchangeDN? The interop service syncs your Google users' f/b data to your Exchange public folder database. The public folder is able to organize the f/b data by user because of the legacyExchangeDN value. As a result, when an Exchange user looks up the f/b status of a Google user, Exchange is able to easily find the right Google user's data.

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