You may see error 0x80190193 when Outlook cannot sync your calendar with a server. This error indicates a failure in the Exchange Web Services connection. This article explains the root cause and provides steps to resolve the sync failure.
Key Takeaways: Fixing Outlook Calendar Sync Error 0x80190193
- File > Account Settings > Repair: This tool can automatically fix authentication and connection problems with your Exchange account.
- Control Panel > Mail > Show Profiles > Remove: Deleting and recreating your Outlook profile resets all local data and often clears persistent sync errors.
- Windows Security > Firewall & network protection > Allow an app: Granting Outlook firewall permissions ensures EWS traffic is not blocked on your computer.
Why Outlook Shows Error 0x80190193 for Calendar Sync
Error code 0x80190193 is an HTTP status code 403, which means Forbidden. In Outlook, this typically happens when the Exchange Web Services request is denied by the server. The server recognizes the request but refuses to authorize it.
The most common reason is incorrect or expired authentication credentials. Your Outlook client may be sending an old password or token that the Exchange server rejects. Another frequent cause is a misconfigured or corrupted local Outlook profile, which stores your account settings and connection data.
How Network and Security Settings Block EWS
Network security software on your computer can interfere with the EWS connection. Windows Defender Firewall or a third-party antivirus may incorrectly identify EWS traffic as a threat and block it. Corporate network proxies can also interrupt the specific ports and protocols EWS uses to communicate with the Exchange server.
Steps to Resolve the Calendar Sync Error
Follow these methods in order, starting with the simplest repair tool.
Method 1: Use the Outlook Account Repair Tool
- Open the Account Settings menu
In Outlook, go to File > Account Settings > Account Settings. - Select your Exchange account
Click on your Microsoft Exchange or Microsoft 365 account in the list to highlight it. - Initiate the repair process
Click the Repair button above the list of accounts. Follow the on-screen prompts, which may ask for your current password. - Restart Outlook
Close and restart Outlook to see if calendar synchronization resumes without the error.
Method 2: Create a New Outlook Profile
- Open the Mail control panel
Close Outlook. Search for “Control Panel” in Windows, open it, and then select Mail (32-bit). - Manage your profiles
In the Mail Setup window, click Show Profiles. - Remove the old profile
Select your current profile from the list and click Remove. Confirm the deletion. - Add a new profile
Click Add. Enter a name for the new profile, then enter your email address and password when prompted to set up the account. - Set the new profile as default
Back in the Mail window, select the option to always use this profile and select your new profile from the dropdown menu. Click Apply and OK, then restart Outlook.
If the Main Fixes Do Not Work
Outlook Still Shows Error 0x80190193 After Profile Rebuild
If the error persists, the problem may be server-side or related to your account permissions. Contact your IT department or email administrator. They need to verify your account has correct Calendar folder access rights on the Exchange server and that EWS application access policies are not blocking your client.
Calendar Sync Works on Web but Not in Outlook Desktop
This confirms your account credentials and server permissions are valid. The issue is isolated to your desktop client. Disable any third-party add-ins in Outlook via File > Options > Add-ins. Test sync with add-ins disabled. Also, check Windows Update to ensure you have the latest cumulative update for Outlook installed.
Error Occurs Only When Syncing a Specific Shared Calendar
The sync failure is likely due to permissions on that specific calendar folder. The owner of the shared calendar must verify you have at least Reviewer permissions. In Outlook on the web, the owner can go to the calendar’s sharing permissions and re-add your account with the correct access level.
Client Authentication Methods for EWS
| Item | Modern Authentication (OAuth 2.0) | Basic Authentication |
|---|---|---|
| Security | Uses tokens and multi-factor authentication | Uses username and password only |
| Server Requirement | Requires Exchange Online or modern hybrid | Works with older on-premises Exchange |
| Error 0x80190193 Cause | Token expired or MFA challenge failed | Password incorrect or expired on server |
| Fix Action | Run Repair tool or re-authenticate in Account Settings | Update password in Windows Credential Manager |
You can now resolve the Outlook calendar sync error 0x80190193. Use the built-in Repair tool as your first action. For ongoing management, regularly check for Outlook updates via File > Office Account > Update Options. An advanced tip is to use the Microsoft Support and Recovery Assistant for automated diagnosis of complex Exchange connection problems.