1. Check Exchange Server Status
- Contact your IT admin or visit the Exchange service dashboard.
- Wait until any downtime or maintenance is resolved.
2. Verify Network Connectivity
- Ensure a stable internet connection.
- Switch to a wired network if Wi-Fi is unreliable.
- Ping the Exchange server to confirm connectivity.
3. Restart Outlook and System
- Close Outlook completely.
- Restart your computer and reopen Outlook to retry the connection.
4. Repair Outlook Profile
- Go to Control Panel → Mail → Show Profiles.
- Select your profile and click Repair.
- Restart Outlook and check synchronisation.
5. Recreate OST File
- Close Outlook.
- Navigate to C:\Users\<YourUsername>\AppData\Local\Microsoft\Outlook.
- Rename the .ost file, then restart Outlook to create a fresh file.
6. Reconfigure Account Settings
- Remove and re-add the Exchange account in Outlook.
- Ensure credentials and server details are accurate.
7. Disable Firewall or Antivirus Temporarily
- Temporarily disable third-party firewalls or antivirus software.
- Check if Outlook syncs; if successful, adjust firewall rules for Outlook.
8. Update Outlook and Windows
- Ensure Outlook and Windows are up-to-date with the latest patches.
- Updates often include fixes for known synchronisation issues.
9. Use Microsoft Support and Recovery Assistant
- Download and run the SaRA tool from Microsoft.
- Follow the prompts to diagnose and fix connectivity problems automatically.
10. Contact Administrator or IT Support
- If the error persists, reach out to your IT admin for deeper server-level checks and permission fixes.