This guide provides a solution for critical issues with Google Workspace Sync for Microsoft Outlook (GWSMO) version 4.3.73.0 that cause Outlook crashes and prevent email sending.
Issue Description
Google's May 28, 2025 update to GWSMO (version 4.3.73.0) introduced several critical bugs that significantly impact Outlook functionality. The update attempted to migrate from the deprecated Contacts API to the People API but introduced new stability issues.
Symptoms
- Outlook crashes immediately upon startup
- Outbound emails are blocked or fail to send
- Synchronization errors with contacts and calendar items
- Task and notes sync failures
- General Outlook instability and performance issues
Affected Systems
Windows systems running Google Workspace Sync for Microsoft Outlook version 4.3.73.0 released on May 28, 2025. All versions of Microsoft Outlook integrated with Google Workspace are potentially affected.
Resolution Steps
-
Set PowerShell Execution Policy
Open PowerShell as Administrator and run:
Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope CurrentUser -Force
This step is mandatory and must be completed before running the fix script.
-
Create the GWSMO Fix Script
Open Notepad and copy the following PowerShell script:
# This script configures GWSMO settings # - Disables sync for ContactsSync, TasksSync, NotesSync, and AddressBookSync # - Turns off all import options # - Sets mailbox size to 50GB (51200 MB) # Define the base registry path for GWSMO settings $basePath = "HKCU:\Software\Google\Google Apps Sync" # Enable sync flags to allow registry control over sync and import options Set-ItemProperty -Path $basePath -Name "SyncFlagsEnabled" -Value 1 -Type DWord # List of products to disable sync for $products = @("ContactsSync", "TasksSync", "NotesSync", "AddressBookSync") # Disable sync for each specified product foreach ($product in $products) { $productPath = Join-Path $basePath $product # Create the product key if it doesn't exist New-Item -Path $productPath -Force | Out-Null # Disable download and upload sync for the product Set-ItemProperty -Path $productPath -Name "DownloadEnabled" -Value 0 -Type DWord Set-ItemProperty -Path $productPath -Name "UploadEnabled" -Value 0 -Type DWord # Additionally, disable the Global Address List (GAL) for AddressBookSync if ($product -eq "AddressBookSync") { Set-ItemProperty -Path $productPath -Name "DynamicGal" -Value 0 -Type DWord } } # Turn off all import options Set-ItemProperty -Path $basePath -Name "ImportEnabled" -Value 0 -Type DWord # Create the Migration key if it doesn't exist and disable import options there $migrationPath = Join-Path $basePath "Migration" New-Item -Path $migrationPath -Force | Out-Null Set-ItemProperty -Path $migrationPath -Name "ImportEnabled" -Value 0 -Type DWord # Set the mailbox size to 50GB (51200 MB) $emailSyncPath = Join-Path $basePath "EmailSync" # Create the EmailSync key if it doesn't exist New-Item -Path $emailSyncPath -Force | Out-Null Set-ItemProperty -Path $emailSyncPath -Name "MaxStorePstSizeMegaBytes" -Value 51200 -Type DWord # Output success message Write-Host "Script completed successfully. GWSMO settings applied for the current user."
Save the file as
fixGW-Outlook.ps1
on your desktop or in a convenient location. -
Run the Fix Script
Open PowerShell, navigate to where you saved the script, and execute:
.\fixGW-Outlook.ps1
The script will disable problematic sync features while preserving core email functionality.
-
Restart Microsoft Outlook
Close Outlook completely and restart it to apply the changes. Outlook should now open without crashing.
-
Verify Email Functionality
Test sending and receiving emails to confirm the fix has resolved the issues.
-
Verify Sync Settings (Optional)
To confirm the fix has been applied correctly, you can check the GWSMO sync settings:
- Right-click the GWSMO icon in your system tray (notification area)
- Select "Turn sync modules on/off..." from the context menu
You should see that the problematic sync modules have been disabled:
The modules shown as "turned off by admin" indicate the fix has been successfully applied.
What the Fix Does
- Disables ContactsSync, TasksSync, NotesSync, and AddressBookSync to prevent crashes
- Turns off problematic import options that cause stability issues
- Sets appropriate mailbox size limits (50GB)
- Preserves core email and calendar functionality
- Enables registry control over sync settings for future management
Enterprise Deployment Options
For organizations with device management solutions like Microsoft Intune, you can deploy this fix at scale:
Option 1: Deploy as PowerShell Script
- Create a PowerShell script deployment in Intune
- Set the script to run in user context (HKCU registry scope)
- Deploy as a logon script or assign to affected user groups
- Monitor deployment status through Intune reporting
Option 2: Deploy Registry Settings Directly
Create custom registry entries in Intune Configuration Profiles for user scope:
Registry Path: HKEY_CURRENT_USER\Software\Google\Google Apps Sync Key: SyncFlagsEnabled, Value: 1 (DWORD) Key: ImportEnabled, Value: 0 (DWORD) Registry Path: HKEY_CURRENT_USER\Software\Google\Google Apps Sync\ContactsSync Key: DownloadEnabled, Value: 0 (DWORD) Key: UploadEnabled, Value: 0 (DWORD) Registry Path: HKEY_CURRENT_USER\Software\Google\Google Apps Sync\TasksSync Key: DownloadEnabled, Value: 0 (DWORD) Key: UploadEnabled, Value: 0 (DWORD) Registry Path: HKEY_CURRENT_USER\Software\Google\Google Apps Sync\NotesSync Key: DownloadEnabled, Value: 0 (DWORD) Key: UploadEnabled, Value: 0 (DWORD) Registry Path: HKEY_CURRENT_USER\Software\Google\Google Apps Sync\AddressBookSync Key: DownloadEnabled, Value: 0 (DWORD) Key: UploadEnabled, Value: 0 (DWORD) Key: DynamicGal, Value: 0 (DWORD) Registry Path: HKEY_CURRENT_USER\Software\Google\Google Apps Sync\EmailSync Key: MaxStorePstSizeMegaBytes, Value: 51200 (DWORD)
Troubleshooting Tips
- If the script fails to run, verify the execution policy was set correctly
- Run PowerShell as Administrator if you encounter permission errors
- Restart your computer if Outlook continues to exhibit issues after applying the fix
- Contact IT support if you need to re-enable any disabled sync features
- Consider downgrading GWSMO if the fix doesn't resolve all issues
- In some cases, you may need to reinstall Google Workspace Sync for Microsoft Outlook and create a new Outlook profile using "Create User Sync" from the Start Menu
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