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on February 5, 2026
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Go to File → Options → Add-ins → disable all add-ins, then re-enable them one by one to find the faulty one. Identifying the root cause helps apply the correct fix — let’s explore the best methods one by one. This ensures Outlook and Windows run the same DLL versions and registry references.
Step 4: Create a New Outlook Profile
This process checks for structural issues and automatically fixes them. After the repair, reopen Outlook to confirm successful startup. This happens when background sync stops due to cache corruption or disabled send/receive tasks. Rebuilding OST and resetting send/receive fixes it in most cases. You might need to set Windows Update to automatically download and web page install recommended updates. Installing any important, recommended, and optional updates can often correct problems by replacing out-of-date files and fixing vulnerabilities.
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Safe Mode allows you to start Outlook with all extensions temporarily disabled. Once the scan completes, reopen Outlook and check if the issue is resolved. Run this command using the Outlook Stuck on Synchronizing Folders same Windows + R dialog box. Outlook will start fresh with default navigation settings.
Fix Outlook and Office 365 Sync Issues (2025 Complete Guide)
Security software can sometimes block Outlook’s connection to the mail server. If it does, whitelist outlook.exe in your antivirus settings. Are you struggling to open Microsoft Outlook on your Windows 11 PC? Many users face this frustrating issue after a Windows update or due to corrupted Outlook how to fix Outlook not opening today data files. In this guide, FixTechGuide explains the top causes and provides simple step-by-step solutions to help you fix Outlook not opening on Windows 11 quickly.
Step 1: Launch Outlook in Safe Mode
You might need to set Windows Update to automatically download and install recommended updates.Outlook and Office 365 sync issues can be frustrating but are almost always fixable.If it does, whitelist outlook.exe in your antivirus settings.By the end, you’ll know exactly how to restore your Outlook and prevent future errors.Are you struggling to open Microsoft Outlook on your Windows 11 PC?Check the status bar at the bottom of the screen to see if another process is running.If your Microsoft Outlook won’t open after a recent Windows update, you’re not alone.
To install the latest Windows and Office updates, click the link below. For persistent issues, use FixTechGuide’s automated tools to perform deep diagnostics and security checks. Stay updated, back up regularly, and enjoy uninterrupted productivity in your Outlook workspace. Certain antivirus tools inspect SSL ports and block push notifications. Whitelist Outlook in your antivirus/firewall settings to restore live sync. If sync logs display "Completed," Outlook is connected.