Fix Microsoft Outlook Error 0x80040154

Microsoft Outlook Error 0x80040154 can occur due to various reasons, including corrupt registry keys, outdated or missing system files, or incorrect settings. Here are some troubleshooting steps to fix the error:

1. Repair Microsoft Office: Repairing Microsoft Office can fix any corrupted system files that may be causing the error. Go to Control Panel > Programs and Features, right-click on Microsoft Office, and select Change. Select Quick Repair or Online Repair.
2. Check for Windows updates: Outdated system files can cause the error. Check for and install any available Windows updates by going to Settings > Update & Security > Windows Update.
3. Re-register DLL files: Re-registering the DLL files associated with Outlook can fix any corrupt registry keys that may be causing the error. Open Command Prompt as an administrator and run the following commands:
   • regsvr32.exe /u msxml3.dll
   • regsvr32.exe msxml3.dll
   • regsvr32.exe /u msxml6.dll
   • regsvr32.exe msxml6.dll
   • regsvr32.exe /u actxprxy.dll
   • regsvr32.exe actxprxy.dll
   • regsvr32.exe /u ole32.dll
   • regsvr32.exe ole32.dll
4. Disable Add-ins: Add-ins can cause conflicts and lead to the error. Disable any third-party add-ins by going to File > Options > Add-ins and unchecking any add-ins listed.
5. Create a new Outlook profile: A corrupt Outlook profile can cause the error. Create a new Outlook profile by going to Control Panel > Mail > Show Profiles and clicking Add.
6. Reinstall Microsoft Outlook: If none of the above steps fix the error, reinstalling Microsoft Outlook may be necessary.

In conclusion, Microsoft Outlook Error 0x80040154 can be fixed by repairing Microsoft Office, checking for Windows updates, re-registering DLL files, disabling add-ins, creating a new Outlook profile, or reinstalling Microsoft Outlook.