1. To enable importing from other webmail hosts:

  1. Sign in to the Google Admin console.
  2. From the dashboard, go to Apps > G Suite > Gmail > Advanced settings.
  3. In the Setup section, check the box next to User email uploads to let users see the option to import mail and contacts from webmail or POP3 accounts, such as Yahoo!, Hotmail, or AOL.Tip: If you don’t see this section, select your account’s top-level organization under Organizations at the top of the page. This feature isn’t available when a sub-organization is selected.
  4. Click Save. There might be a delay before changes take effect.
  5. Tell your users to go to Gmail > Settings to start the import process. For details, see Import contacts into your Gmail account and Check email from other accounts with Gmail.

2. Install G Suite Migration for Microsoft Outlook

After you have configured G Suite, verified the Windows system requirements on each client machine, provisioned your users in G Suite, and migrated your shared contacts, your next step is to install G Suite Migration for Microsoft Outlook on each user’s computer.

You have two options for installation:

  • Push an .msi to your users, and let them use the Run Advertised Programs option in the Windows Control Panel. Download the .msi file below (be sure to pick the correct version for your users’ version of Outlook). For information on implementing the .msi file, consult your Windows documentation.

    Download the GoogleAppsClientMigration.msi:

  • Let your users get the utility from the GSMMO download page, and complete the installation themselves.

To run the installer:

Double-click OutlookMigrationSetup.exe, then click Run.

The utility is installed in the following location:
C:\Program Files\Google\Google Apps Migration\ClientMigration.exe.