Now, let’s look at how to fix these issues step by step. If none of the above fixes work, the problem may be caused by deeper corruption or Microsoft Outlook troubleshooting server-side issues. In that case, it’s best to contact Microsoft Support or your IT administrator. If disabling the antivirus resolves the issue, consider using built-in Windows Defender as it is less likely to cause conflicts. Your trusted tech help & troubleshooting hub. If the error occurs during a Windows update, the Windows Troubleshooter can help identify and fix the problem.