Understand Exchange Online data migration reports

Source user

Email address of the user on the source account

Target user

Email address of the user on the target account

Status

Status of the user's migration:

• Running: Migration is in progress.
• Failed: Migration didn't complete because of discovery issues. To troubleshoot, check the migration report for the specified error.
• Completed: Migration completed successfully. Any messages or labels that didn’t migrate are listed in the migration error report.

Note: This report does not have a Skipped status because users are never skipped.

Emails migrated successfully

Number of messages migrated successfully for the user (including messages that were skipped in an earlier migration)

Emails failed

Number of messages that failed to migrate for the user

Calendar events migrated successfully

Discovery failures 

1. Number of folders whose messages and associated subfolders were not discovered, either partially or fully
2. Number of calendars whose events were not discovered, either partially or fully

Status details

Status

The migration status of the item:

• Success: The item migrated
• Warning: The item migrated, but failed to complete as expected (for example, when an email migrates without the label associated with it)
• Error: The item didn't migrate due to an error. Learn more about how to resolve common error messages
• Skipped: The item was skipped. Items can be skipped for the following reasons:
  • The item was migrated in a previous migration and wasn't updated in the source account before a delta migration
  • The item was migrated to one user, then later migrated to a different user in the same migration wave (the migration wasn't exited and re-established)

Error/warning code & description

The code and message associated with the error or warning status. Learn more about how to resolve common error messages

Processing start time

Processing end time

The migration start and end time for the item

Source type & source identifier

• Exchange Online Email Folder Crawler: mailboxes/user_email/folders/folder_id
• Exchange Online Email Folder: mailboxes/user_email/folders/folder_id
• Exchange Online Email Message Crawler: mailboxes/user_email/folders/folder_id
• Exchange Online Email Message: mailboxes/user_email/messages/message_id
• Exchange Online Calendar Crawler: users/{user}
• Exchange Online Calendar: users/{user}/calendars/{calendar}
• Exchange Online Event Crawler: users/{user}/calendars/{calendar}
• Exchange Online Event: users/{user}/calendars/{calendar}/events/{event}

Target type & target identifier

• Gmail message: users/user_email/messages/message_id
• Gmail label: users/user_email/labels/label_id
• Calendar: users/{user}/calendars/{calendar}
• Calendar event: users/{user}/calendars/{calendar}/events/{event}

Temporary error occurred

A transient error. Run a delta migration.

User not found

A user in the migration map wasn't found. Either the domain or the username is incorrect. Try the following steps:

• Confirm the emails in the CSV file you uploaded in Step 3: Create a map from Exchange Online to Google Workspace are correct. Then, update any incorrect emails in the file and try uploading it again.
• Export the User Report and check the source and target users are correct. 
• In the migration settings of Step 4: Choose which emails to copy, make sure you have chosen the correct option under Map identities that aren't included in the identity maps, but discovered during the migration.

The source email address is invalid

The user is not present in the source account. Add the user to the source account, and run a delta migration.

Virus or other attachment problem

Gmail blocks messages that might spread viruses, such as messages that include executable files or certain links.

For more information, go to File types blocked in Gmail.

Connection not in usable state

Your connection contains errors and is no longer in a usable state.

Disconnect and create a new connection. For details, go to Connect to your Microsoft account.

All required OAuth scopes have not been granted access

Some or all of the required OAuth scopes haven't been granted domain-wide delegation.

Disconnect and create a new connection. For details, go to Connect to your Microsoft account.

Error occurred while generating user credential

Domain-wide delegation hasn't been granted. In most cases, the domain-wide delegation process completes within a few hours, but you should allow up to 24 hours.

When the process is complete, run a delta migration to retry the failed tasks.

Found entries missing in the identity mapping for <username>

A source user that was not mapped to a target user in the identity map was discovered during the migration.

1. Remove the identity map.
2. Correct the source user mapping.
3. Upload the corrected map.

For details, go to Create a map from Exchange Online to Google Workspace.

Invalid user provided in migration mapping

A user email ID in the migration map is invalid or is not a Google email ID.

1. Remove the migration map.
2. Correct the source user mapping.
3. Upload the corrected map.

For details, go to Create a map from Exchange Online to Google Workspace.

User provided in migration mapping does not belong to a Workspace customer

A target user email in the migration map is not a Google Workspace email.

1. Remove the migration map.
2. Correct the target user mapping.
3. Upload the corrected map.

For details, go to Create a map from Exchange Online to Google Workspace.

Label name exists or conflicts with label

A label on the source account already exists on the target account. Remove the label from the target account and run a delta migration.

Mail service not enabled

Turn on the Gmail service for your users. For details, go to Control Gmail access for your organization’s users.

If the error persists, wait for a few hours and try the migration again.

Unable to fetch resources for crawling source mailbox

Failed to crawl the source mailbox

Failed to authenticate with the source mailbox

Deadline hit while crawling the source mailbox

Source mailbox quota has exceeded

These are temporary issues. Wait a few hours then run a delta migration.

Draft emails in Outlook must have exactly one email address in the From field or they will trigger this error.

1. Ensure your draft emails have one address in the From field.
2. Run a delta migration.

After the migration, if the event has been modified in Google Calendar, then it cannot be migrated again (either full migration or delta migration). 

To migrate the event again, delete the corresponding event in Google Calendar, and rerun the migration.

Unsupported recurrence pattern in Google Calendar.

Calendar quota has exceeded. Please try again later.

Unable to fetch resources for writing to target calendar. Please try running a delta migration.

Source user fetch failed for attendees: <username1>,<username2>

Source user fetch failed for organizer: <username1>