GSSMO error codes and messages

You might encounter the following error codes and messages when using G Suite Sync for Microsoft® Outlook® (GSSMO). The error codes are located in the GSSMO tracing logs. 

Where do I find the tracing logs?

Tracing logs are located on your computer in the following location:

  • Windows® Vista, 7, 8, and 10: C:\Users\your-user-name\AppData\Local\Google\Google Apps Sync\Tracing\

Use Log Analyzer

As an alternative to researching error codes, you can submit your trace files to our GSSMO Log Analyzer. Most issues can be identified within a few moments of your submission.

Errors and messages

GSSMO error codes
Error code Description
0x00040680 The conversion of a calendar invite from the Google Calendar to Microsoft Outlook format failed. To resolve this issue, delete and recreate the event. 
0x80004005 Some timezone registries are missing on the host computer. Ensure that the client computer has the latest Windows updates. Consult your Microsoft documentation for information. 
0x8000ffff Your network is unable to reach or timed out when sending an email. Contact your network administrator for assistance.
0x80040109 There might be a problem with anti-virus software or another application accessing the user's PST files. Disable the applications temporarily and see if this resolves the issue. If it does, exclude the PST directory from your anti-virus scans.
0x8004010d The disk is full or the machine is using a FAT32 file system, which can't handle files larger than 4 GB. Try setting the mailbox size limit to 1 GB and re-syncing. See Set a local mailbox size.
0x80040111 The source profile for your import seems to have been deleted. Cancel the import or create a new profile.
0x80040116 The languages of the Outlook profiles you're using for import don't match. Update to a more recent version of GSSMO. See Install GSSMO

The PST file holding the current user profile is corrupt.

To fix this, consult your Microsoft documentation on how to repair PST files.

0x8004060c Your PST file size is too large for Outlook. Create a new profile with a smaller size limit. See Create or replace your profile and Set a local mailbox size
0x80040610 You have an email that is too large in your Outbox. Delete the email or edit it to be smaller.
0x80040811 Your calendar is too large for Outlook to display. If the following registry key is present, remove it:

HKEY_CURRENT_USER\Software\Microsoft\Office\version number\Outlook\PST\UseLegacyCacheSize


This error usually means that an Exchange message store and a GSSMO message store exist in the same profile. Storing both accounts in the same user profile isn't supported.

Google servers detected messages that can't be handled. The messages might contain a virus. Or, they might be duplicate messages.

  • Messages with a virus–If you suspect a virus on the client machine or if the error continues, run an anti-virus scan.
  • Duplicate messages–This error will clear after a few minutes.
0x80070005 This issue typically occurs when there is a configured limit to the PST file size. Consult your Microsoft documentation for information on how to configure the size limit for PST files in Outlook. 
0x8007007e Outlook is unable to load the correct gsync32.dll file. Verify that the only copy in your system is in C:\Program Files\Google\Google Apps Sync or C:\Program Files (x86)\Google\Google Apps Sync. Then, make sure that you have permission to execute it.
0x800704dc Login authentication failed. The error code you see signifies a configuration issue on the machine. You might need to re-register your DLLs on the client computer. Consult your Microsoft documentation on how to do this. 

This issue can occur if the network timeout registry entries have been created using the wrong registry data type (for example, REG_SZ instead of REG_DWORD).

  1. Go to the Registry Editor (regedit).
  2. Make sure all entries under HKEY_CURRENT_USER\Software\Google\Google Apps Sync\Other are of type REG_DWORD and not any other type.
0x8007273d Winsock is corrupt on the client computer. Consult your Microsoft documentation on how to resolve this. 
GSSMO is experiencing network timeouts. Extend the time out period by modifying your Windows registry. For details, see Large messages time out over a slow connection.
0x80072f78 GSSMO is unable to sync some of your email. This is likely due to network issues or very large messages. For details, see Large messages time out over a slow connection.

This issue occurs if:

  • The time is set incorrectly on the local machine.
  • The local certificate store is incorrect.
  • A proxy or firewall configuration is blocking GSSMO.

Check for these issues on the host computer. 


The email database for GSSMO has become corrupt. This issue is usually caused by a crash on the client machine when GSSMO is syncing.

Remove and reinstall the current profile. See Create or replace your profile.

GSSMO error messages
Error message Description
Can't handle conflicting folder (): Contacts If you update a contact from both Outlook and G Suite or a mobile device, a conflict can occur because GSSMO retains 2 versions of the contact. You don't lose any data when this happens—both versions of the contact are retained. See I receive conflict errors when synchronizing contacts
Cannot open your default email folder...MAPI was unable to load the information service gsync.dll Search your system for gsync32.dll and remove any duplicates. Or, you can reinstall Outlook.
E:FreeBusy gsync32!FreeBusyServer::

Free/Busy status doesn't work. 

To fix this:

  1. Got to HKLM\SOFTWARE\Microsoft\Office\12.0\Outlook\ SchedulingInformation\FreeBusySupport.
  2. Set the value of SMTP to {0006F049-0000-0000-C000-000000000046}
error: .vir. The server won't send some messages with attachments because it detects a virus. Scan for viruses to resolve this issue.
FreeBusy gsync32!FreeBusyServer::

The logs indicate that Free/Busy functionality won't work due to local settings.

To fix this:

  1. Go to HKLM\SOFTWARE\Microsoft\Office\12.0\Outlook\ SchedulingInformation\FreeBusySupport.
  2. Set the value of SMTP to {0006F049-0000-0000-C000-000000000046}
This error usually means that an Exchange message store and a GSSMO message store exist in the same profile. Storing both accounts in the same user profile isn't supported.
HTTP/1.1 401 Service disabled by G Suite admin Google Calendar service isn't enabled for your domain in the Google Admin console. See Turn Calendar on or off for users
HTTP/1.1 403 This domain does not allow users to access the Email Migration API. To fix this issue, you need to enable API access in the Admin console.
HTTP/1.1 413 Request Entity Too Large A web proxy or another network system on your network is blocking large requests. Make sure your network is configured to allow these requests. For further details, review your proxy logs.
HTTP/1.1 502 Bad Gateway GSSMO is experiencing network timeouts. Extend the time out period by modifying your Windows registry. See Large messages can time out over a slow connection.
HTTP/1\.1 500 Internal Server Error There may be transient connectivity issues with Google servers. Check that you're able to connect to name. If you are able to connect without issue, then ensure that the following URLs are available on your network through port 443:
  • Signing:
  • Calendar:
  • Contacts:
  • Email:
  • Email Migration:[domain]
If your computer can contact those addresses and you're able to access mail from the web, then you need to contact Google Cloud Support for further help. 


HTTP/1.1 400 Bad Request

You could be using a network proxy. Proxies aren't supported with GSSMO. However, if all traffic is allowed on port 443 for Outlook.exe and ProfileEditor.exe, there should be no problems. 
MAPI was unable to load the information service gsync\.dll

There may be a few causes for this problem. Verify the following:

  • Make sure that the only copy of gsync32.dll on your system is located in C:\Program Files\Google\Google Apps Sync.
  • Make sure the affected user has read/execute permission in that directory.
  • Check that the client computer has the file C:\Program Files\Common Files\System\MSMAPI\1033.
  • Restart the system.
  • Ensure that .dll files are associated with Microsoft Office.

If the above steps don't fully resolve the issue, uninstall and reinstall Outlook and GSSMO.

MAPIToMIMEStm threw exception with message The MAPI-to-MIME conversion of one or more of your email messages failed. Try to send the message again. If the issue persists, reinstall Outlook.
Max file size This affected user has reached the mailbox size limit set in GSSMO. If the user wants to synchronize their entire mailbox, they must set the limit to Unlimited. See Set a local mailbox size.
Permanent failure: BadAttachment The logs indicate that you are trying to send attachments that Gmail doesn't support. See Executable file attachments aren't appearing anywhere
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