Outlook se ferme au démarrage

Hi @Arnaud Mulliez , 

Thanks for your post in Microsoft community. I understand how frustrating it is when Outlook keeps closing on startup, especially after reinstalling Office. Don't worry - we'll work through this together. Here are some steps that may help: 

Step 1: Try Opening Outlook in Safe Mode 

Sometimes, a faulty add-in can cause Outlook to crash. To check: 

• Press Windows + R, type outlook.exe /safe, and hit Enter. 
• If Outlook opens successfully, the issue might be an add-in. 

Step 2: Disable Add-ins 

If Outlook runs in Safe Mode: Turn an add-in off for Outlook for Windows - Microsoft Support 

• Click File > Options > Add-ins. 
• Select COM Add-ins, then click Go. 
• Uncheck all add-ins and restart Outlook. 

Step 3: Repair Microsoft Office 

A damaged Office installation could be the root of the problem. 

• Open Control Panel > Programs > Programs and Features. 
• Find Microsoft Office, click Change, then choose Quick Repair. 

Note: Before proceeding, it's strongly recommended to back up your entire mailbox data to prevent any loss. 

Step 4: Use Microsoft’s Repair Tool 

Microsoft provides an automatic repair tool that may resolve Outlook startup issues: Running troubleshooters in Get Help - Microsoft Support 

• Launch the tool after installation.  
• Sign in using the Office 365 credentials of the affected user. 
• Select the issue from the provided list based on the problem you're experiencing. 
• The Support and Recovery Assistant will then run a series of automated tests to diagnose and resolve the issue.

Step 5: Roll Back to a Previous Working Version 

If Outlook remains inaccessible after following the previous steps, consider this as a final troubleshooting option. 

• Open Command Prompt as an administrator. 
• Run this command: "C:\Program Files\Common Files\microsoft shared\ClickToRun\OfficeC2RClient.exe" /update user updatetoversion=16.0.12827.20470  

Ref: Fix Outlook closing automatically issue on windows 11/10

(Note: Microsoft is providing this information as a convenience to you. The sites are not controlled by Microsoft. Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please make sure that you completely understand the risk before retrieving any suggestions from the above link)

I hope one of these steps gets Outlook running smoothly for you! Let me know how it goes - I'm happy to help.  

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