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{{tag>mail gmail migration}}

====== Migrating gmail from one G suite account to another ======
<WRAP info>
If you have Essentials edition Google Workspace edition (aka Gsuite), you can only migrate contacts. You can't migrate email or calendar data.((https://support.google.com/a/answer/9476255))
</WRAP>
<WRAP info>
The data migration service does not remove data from the source mailbox, nor does it remove the original source mailbox. All eligible data is copied during a migration, not moved/deleted, and the data in your source mailbox remains after a migration.((https://support.google.com/a/answer/7032598))
</WRAP>
<WRAP info>
You can’t migrate messages bigger than 25 MB.((https://support.google.com/a/answer/7032598))
</WRAP>
<WRAP important 60%>
Migrating large mail accounts might take a lot of time. For example migration of cca. 1.5GB mail account took almost 3 days!!! But this will depend on how many attachments there are in the account, number of emails etc.
</WRAP>

===== NOTES: =====

  * Enable IMAP on both the source and destination account
  * "Folder size limits" in Gmail Settings must be set to "Do not limit the number of messages in an IMAP folder (default)". This is the default.
  * when migrating from multiple domains you must add MX records for them
  * on the migration assistant screen, when you are done with emails from one domain exit the Migration Assistant (**More > Exit migration**) then start the migration again for the users with new domains. If you don't do this you'll get an error "Failed estimating mailbox size".
  * if you are transferring the same domain, make a temporary domain with mx records on the source account and move user's email to this domain. Then remove the domain from source account and add it to the destination account
  * domain can only be removed once the user's email and email aliases are removed (**check each user > User information > Alternate email addresses (email alias)**). Remove the domain you are transferring from here.


===== Set up the data migration service =====

      - Sign in to your Google Admin console.
  -     Sign in using an account with super administrator privileges (not your current account user@gmail.com).
  -     From the Admin console Home page, go to Data migration.
  -     Click Set Data Migration Up.
  -     Under Migration Source, select Google Workspace.
  -     Click Start.
  -     Under Migration Start Date, accept the option that appears or choose a start date for your migration.
  -     Under Migration Options, accept the options that appear or choose to exclude some data.
  -     Click Select Users.

===== Migrate email from another Google Workspace account =====
Perform the following steps on your target Google Workspace domain (the account you're migrating to).

==== Migrate email for a single user ====
     -  Click Add user.
  -     In the Source Email field, enter the user's legacy Google Workspace email address.
  -     In the Google Workspace Email field, start entering the user's new Google Workspace email address and choose from the list of suggested users.
  -     In the Password field, enter the user's password for their legacy email account.
  -     Click Start.
  -     (Optional) To migrate another user's email, repeat these steps.


==== Migrate email for multiple users ====

  -     Click Bulk upload with csv.
  -     Click Attach File to upload the migration CSV file containing the legacy email addresses and the new Google Workspace email addresses.
  -     For details on how to format the file, see references below.
  -     Click Upload and Start Migration.
  -     If there are errors in your file, choose an option:
  -         To update the file, click Cancel. Then, upload the updated file.
  -         To ignore the incorrect mappings, check the Ignore errors box.

Tip: To exit a completed migration, click Moreand thenExit migration.


====== See also ======
  * [[wiki:disable_gmail_login_challenge_logging_some_user|Disable login challenge by google]]
  * [[wiki:gdrive_dload script|Google drive download script]]

====== References ======
  * https://jakebinstein.com/blog/migrate-email-from-one-g-suite-account-to-another-tutorial/
  * https://support.google.com/a/answer/9476255