Troubleshoot a Microsoft Outlook migration

Here are some steps to troubleshoot this problem:

• Check you're connected to the web during the migration and that you're not experiencing network connectivity issues.
• Make sure Outlook is closed during the migration.
• Don't import from an OST file. GWMMO supports importing only from a PST file or directly from an Exchange account. For details, go to What's migrated?

This happens when you import contact data multiple times into the same Google Workspace account. Import your contacts only once. If you do end up with duplicate data, do one of the following:

• Delete all your personal contacts from your Google Workspace account. Then, use GWMMO to reimport your contacts.
• Remove duplicate contacts manually from Google Workspace.

Yes. The rest of your data will continue importing unattended. If your migration wizard is still open, you can open the Migration log file from the wizard's progress screen to view a list of errors. Otherwise, to find your trace log files, go to Where do I find the logs?

GWMMO currently doesn't migrate certain message classes, including read receipts and delivery/non-delivery reports. For details, go to What's migrated?

If you import a message with large attachments (multiple megabytes) over a slow connection, the connection can time out. After multiple retries, the migration stops and you'll see the Windows Update error code 80072ee2 in the log files.

By default, the connection timeout is 120 seconds. You can extend this period to accommodate messages that take longer than 120 seconds to migrate by modifying your Windows registry. Specifically, add the following keys to override the default timeout values:

• HKEY_CURRENT_USER\Software\Google\Google Apps Migration\Other\ResolveTimeoutSeconds > DWORD Value = 00000030
• HKEY_CURRENT_USER\Software\Google\Google Apps Migration\Other\ConnectTimeoutSeconds > DWORD Value = 00000030
• HKEY_CURRENT_USER\Software\Google\Google Apps Migration\Other\SendTimeoutSeconds > DWORD Value = 00000600

The example values above give timeout periods in seconds, and can be adjusted to accommodate your connection.

How do I add these keys to my registry?

1. In the Start menu, click Windows SystemRun.

   Alternatively, press the Windows key + r.

2. For Run, specify regedit.

   Note: If you're running a 32-bit version of Outlook on a 64-bit version of Windows, you need to add these registry keys in the correct location for 32-bit applications. For details, go to Using a 32-bit version of Outlook on a 64-bit version of Windows.

3. In the registry, go to HKEY_CURRENT_USER\Software\Google\Google Apps Migration\.
4. Click EditNewKey to create a new key folder.
5. Specify Other as the name of the key, and press Enter.
6. Select the Other folder you just created.
7. Click Edit NewDWORD (32-bit) Value.
8. Specify ResolveTimeoutSeconds as the new value, and press Enter.
9. Right-click the ResolveTimeoutSeconds value you just created and select Modify.
10. In the Edit DWORD (32-bit) Value box, under Value data, specify your desired timeout value (00000030, in our example above).
11. Click OK.
12. Repeat steps 6–11 to create a DWORD (32-bit) Value for the other two timeout registry keys listed above:
    • ConnectTimeoutSeconds:
      • DWORD (32-bit) Value—ConnectTimeoutSeconds
      • Value data—00000030
    • SendTimeoutSeconds:
      • DWORD (32-bit) Value—SendTimeoutSeconds
      • Value data—00000600

To turn on different logging levels (Information, Verbose, or Performance) for GWMMO, edit the Tracing registry key folder and its accompanying REG_DWORD value.

1. In the Start menu, click Windows SystemRun.

   Alternatively, press the Windows key + r.

2. For Run, specify regedit.

   Note: If you're running a 32-bit version of Outlook on a 64-bit version of Windows, you need to add these registry keys in the correct location for 32-bit applications. For details, go to Using a 32-bit version of Outlook on a 64-bit version of Windows.

3. In the registry, go to HKEY_CURRENT_USER\Software\Google\Google Apps Migration\.
4. Select the Tracing folder.
5. Right-click the Level value and select Modify.
6. In the Edit DWORD (32-bit) Value box, under Value data, change the default value of 7 to one of the following hexadecimal values:
   • f—Information
   • ff—Verbose
   • 4F—Performance
7. Click OK.

Note: Verbose logging can generate large log files, which can impact performance and the availability of disk space.

Following a migration, you might notice the number of email messages in the source account exceeds the number of messages migrated to Gmail.

This discrepancy might be due to the difference between folders in Exchange and IMAP mail servers and labels in Gmail. In Exchange and on IMAP mail servers, when you assign a message to more than one folder, the message is duplicated. Following a migration, the duplications are removed in Gmail and different labels are applied instead.

To verify all messages are migrated, check the logs for any errors. To find your trace log files, go to Where do I find the logs?

If you think you're missing messages, check the message. It will not get migrated if:

• The message, including attachments, is bigger than 25 MB.
• The message contains an attachment that isn't permitted by Gmail, such as an executable file. For details, go to File types blocked in Gmail.
• The message is in a folder or within a date range that has been excluded from the migration.

If you think some labels weren't migrated, check whether the trace log files contain the information message Skipping hidden folder. If listed, it means the folder in the source account wasn't detected.

This warning occurs when you import events for users who are not an original organizer or initial attendee for the event.

Regardless of the warning message, the event successfully migrates into Google Workspace and the Google Workspace target user is shown as an attendee of the event on the Google Calendar. This is necessary as Google Calendar doesn't support listing calendar events for a user where they aren't an organizer or attendee.

If you experience network-connectivity issues, you should approve the following URLs:

Note: If you're using a Windows parental control system, you might need to add URLs to your allowlist. For details, consult your Microsoft documentation.

Related topics

• Google IP address ranges (GWMMO can use any one of these IP addresses)
• CRL check

Yes, potentially. For example, you could exceed API limits if you run a single migration from multiple source accounts to a single destination account.

To avoid this issue, run consecutive migrations from a single source to the destination.