Cannot Start Microsoft Outlook

If the Outlook app is taking time to start or is not starting at all on your Windows computer, try these simple troubleshooting solutions: 

Start Outlook in Safe Mode 

• Press Windows + R or search for ‘Run’ in the search bar.

• In the Run box, type outlook.exe /safe.

• Click OK.

If the profile selection window appears, select your profile and click the OK button. 

Repair Microsoft Office Installation 

• Click the Windows Start button.

• Search Control Panel, then open it.

• Make sure View by is set to Category.

• Under the Programs section, click on “Uninstall a Program.”

• Scroll down and find and click Microsoft Office.

• Click on the Change option.

• Select Quick Repair.

• Click the Repair button.

• Wait for a while and let the repair process complete.

• Once it is done, close Outlook and launch it again to see if the issue is resolved.
  
  

Modifying Registry

• Press Windows + R, type “regedit,” and press Enter.

• In Registry Editor, go to: HKEY_CURRENT_USER\Software\Microsoft\Office\<YourVersion>\Outlook\AutoDiscover.

• Right-click in the right pane.

• Select New > DWORD (32-bit) Value.

• Name it ExcludeScpLookup.

• Set Value Data to 1, and click OK.
  
  

Clearing Outlook Cache 

• Open the Run box.

• Type %localappdata%\Microsoft\, and press Enter.

• Find the Outlook folder and change its name to Outlook.old.

• Restart your computer to apply the changes.

Source:- Cannot Start Microsoft Outlook