Migrate email from an IMAP account

1. Sign in to your Google Admin console.

   Sign in using an account with super administrator privileges (does not end in @gmail.com).

2. In the Admin console, go to Menu  DataData import & exportData migration.
3. At the top, click Go to the new data migration service.
4. For IMAP, click Migrate.
5. For IMAP server address, enter the address of the IMAP server, for example, imap.example.com.

   For assistance with this information, go to the Connection information for common IMAP-based webmail providers table (later in this section).

6. Click Test connection.

   If the connection is successful, you get a Connected notification.

Connection information for common IMAP-based webmail providers

If your provider isn't listed here, check your provider's documentation for this information.

You use a migration map to connect users on the source account to users on the target account. The new data migration service uses the migration map to transfer email data from the source user to the target user.

The mapping file requires you to enter the user's password from their source account. However, some IMAP servers require the user to create an app password instead. For details on app passwords and whether they are required, consult your IMAP server documentation.

1. Create the mapping file

Tip: Click Download sample CSV to get an example comma-separated values (CSV) file that you can use.

1. In a spreadsheet program, add the following headers:
   • Source ImapUser—The user's email address on the source account
   • Source ImapPassword—The user's password on the source account
   • Target GUser—The user's email address on the target account

   You can download a list of users from your Admin console. For details, go to Download a list of users.

2. Using valid email addresses, map the users and their passwords under the headers (both addresses are mandatory). Be aware of the following points:
   • You can't map a single source user to more than one target user.
   • Make sure the file contains no more than 100 source users and doesn't exceed 128 MB in size.

     The new data migration service currently supports a maximum of 100 users for IMAP migrations.

3. Save the spreadsheet as a CSV file.

Example:

In this example, the source domain is example.com. The target domain is solarmora.com.

2. Upload the file

1. In the Admin console of your target account, click Upload CSV.
2. Go to and select your CSV mapping fileclick Open.
3. Click Tasks to confirm that the mapping file has successfully been uploaded.
4. If you get an error message, correct your CSV file. Then, repeat steps 1–2 to upload your mapping file.

1. Click Start date and enter the date that you want messages migrated from.

   The new data migration service migrates messages from the selected date to the date that you start the migration.

2. (Optional) To migrate email messages that have been deleted, check the Migrate deleted emails box.
3. (Optional) To migrate email messages with the Spam label, check the Migrate spam emails box.
4. (Optional) If you don't want to migrate messages that have specific labels, check the Exclude specific folders from migration box, and enter the label names, separated by commas.

   For details, go to How to exclude folders from migration (in the next section).

5. Click Save.

How to exclude folders from migration

• Specify each folder or subfolder separately.
• When you add a subfolder, use the full path and separate the parent folder from the subfolder with a forward slash (/).

  Example: You want to exclude the folder Travel and its child folder, Asia. To do so, you enter Travel,Travel/Asia.

You must be signed in as a super administrator for this task.

1. Click Start migration.

   This action also grants domain-wide delegation and creates a client ID for Data Migration (New) in the target account. For more information, go to Control API access with domain-wide delegation.

2. The status changes to In progress, and the following information is updated in real time:
   • Discovered tasks—Total number of items (messages, labels, and other tasks) that were migrated, skipped, or failed
   • Warning—Number of items that were migrated, but failed to complete as expected
   • Failed—Number of items that failed to migrate, due to an error
   • Skipped—Number of items that were skipped
   • Successful—Number of items that were migrated successfully
   • Users processed—Number of users whose migration has completed
   • Emails discovered—Number of email messages that were migrated, skipped, or failed
   • Emails migrated—Number of email messages that were migrated
   • Emails skipped—Number of email messages that were skipped
   • Emails failed–Number of email messages that failed to migrate
3. To export and interpret the reports, go to Understand the new data migration service reports.

To move data that has been added to the source account since the primary migration, run a delta migration. For details, go to Run a delta migration.