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How to Fix Outlook Crashing or Not Syncing in Windows

Issue Description 

Outlook may crash, freeze, or fail to sync emails properly. 

Common Causes 

  • Corrupt Outlook profile 
  • Faulty add-ins 
  • Large mailbox files 

Step-by-Step Solution 

Step 1: Start Outlook in Safe Mode 

  • Press Windows + R 
  • Type outlook.exe /safe 
  • Press Enter 

 If Outlook works, disable add-ins 

 

Step 2: Disable Add-ins 

  • Open File → Options → Add-ins 
  • Manage COM Add-ins → Go 
  • Uncheck all add-ins 
  • Restart Outlook 

 

Step 3: Repair Outlook Profile 

  • Open Control Panel → Mail 
  • Click Show Profiles → Add 
  • Create new profile 
  • Set it as default 

 

Step 4: Repair Office 

  • Open Apps → Installed apps 
  • Select Microsoft Office → Modify → Quick Repair 

Explore Further 

  • Reduce mailbox size 
  • Rebuild OST file 

Prevention & Best Practices 

Keep Office updated and limit add-ins.