This ensures Outlook and Windows run the same DLL versions and registry references.

Use Microsoft Support and Recovery Assistant (SaRA)

Go to File → Office troubleshoot Outlook synchronizing folders error Account → Update Options → Update Now. The built-in Auto-Detect Utility ensures complete privacy—your credentials never leave your device. Run a full scan through the dashboard and receive a detailed report on configuration health, certificate status, and network connectivity.

Step 8 – Recreate Your Outlook Profile

• Start with basic network checks, enable Cached Exchange Mode, and repair your data files if needed.
• Following the above steps—from safe mode diagnostics to repairing data files—will restore functionality in most cases.
• This ensures Outlook and Windows run the same DLL versions and registry references.
• It automatically repairs sync and credential problems for Outlook and Exchange accounts.
• Occasionally, classic Outlook tries to run a process in the background.
• Stay updated, back up regularly, and enjoy uninterrupted productivity in your Outlook workspace.
• This process checks for structural issues and automatically fixes them.
• It’s better to clear cache, recreate send/receive groups, and reset your profile for faster results.

Once back online, Outlook will immediately start syncing your mailbox with the server. It’s better to clear cache, recreate send/receive groups, and reset your profile for faster results. You can start Outlook in safe mode, disable your add-ins, and then try to open Outlook normally.

Why Outlook Fails to Update Until Restart

Following the above steps—from safe mode diagnostics to repairing data files—will restore functionality in most cases. Outlook and Office 365 sync issues can be frustrating but are almost always fixable. Start with basic network checks, enable Cached Exchange Mode, and repair your data files if needed. FixTechGuide’s free email diagnostic tools automate send/receive error 0x800CCC0E fix error detection by scanning your configuration files, registry entries, and mail protocols. Security software can sometimes block Outlook’s connection to the mail server. If it does, whitelist outlook.exe in your antivirus settings.

How to Fix Outlook Not Opening on Windows 11

Rebuilding OST and resetting send/receive fixes it in most cases. You might need to set Windows Update to automatically download and install recommended updates. Installing any important, recommended, and optional updates can often correct problems by replacing out-of-date files and fixing vulnerabilities. To install the latest Windows and Office updates, click the link below.



Download the tool from Microsoft and run the Outlook diagnostic to auto-detect server and account issues. This often resolves startup errors caused by configuration issues. Open Control Panel → Programs and Features → Microsoft Office → Change → Quick Repair. If the issue persists, select "Online Repair" to reinstall essential Outlook components without deleting your data. Download and run SaRA Tool (Support and Recovery Assistant) from Microsoft’s official site. It automatically repairs sync Outlook Not Sending or Receiving Email and credential problems for Outlook and Exchange accounts.