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Migrate data from Exchange using GAMME

If you've set up your organization to use Google Apps, you can migrate users' mail, calendars and contacts from your Microsoft® Exchange environment to Google Apps using Google Apps Migration for Microsoft Exchange (GAMME).

1. Before you begin

2. Authorize GAMME for your domain

Before you can install GAMME, you must authorize the software for your domain. For details, see Authorize GAMME for your domain.

3. Configure GAMME

Step 1 of 3: Server details

  1. For Server Type, select Exchange.
  2. In the Hostname/IP Address field, enter your domain name or the IP address of the email server from which you want to migrate data. For example: or 198.102.434.8.
  3. In the Admin username field, enter the username for the Exchange administrator account you want to use to open your users' mail stores.
  4. Calendar resources: If you are migrating calendar resources, do the following:
    1. To avoid migration errors, use a separate Google Apps admin account for each GAMME instance. 
    2. Change the number of parallel migrations in GAMME from 25 (default) to 1.

    For more information on migrating calendar resources, see the "Best practices for your migration" chapter in the GAMME Admin Guide.

  5. Click Next.

Step 2 of 3: User and domain information

  1. In the Google Apps domain name field, enter the new primary Google Apps domain where the data will be migrated.
  2. In the Service account credentials file field, enter the path to your credentials JSON file that was created as part of the authorization process.
  3. In the Google Apps admin user field, enter the full email address of your Google Apps domain super administrator.
  4. Click Next.

Step 3 of 3: Data to migrate and migration settings

  1. Select the checkbox for each type of data you want to migrate: email, calendar, or contacts.
  2. Click Next.
  3. Review and optionally make changes to the settings:
    • Migrate all data: Only use this option if you are migrating an account again.
    • Save settings: When checked, the utility will retain the current configuration for future use.
    • Run Diagnostics: When checked, the utility will verify the configuration before running the migration.
    • Estimate: When checked, the utility will estimate the message count for the source users.
    • Migrate: When checked, the utility will perform the migration.
  4. Click Next.
  5. In the dialog box that appears, enter the username and password for the Exchange administrator account you are using to open your users' mail stores. Selecting Remember my password will bypass this step in future migrations.
  6. Click OK to begin the migration process.
To learn more about GAMME, see the GAMME Admin Guide, which includes detailed information about how the utility works, getting started, and running your migration.
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