This Error 0x80040154 is one of the most typical Microsoft Outlook errors, which occurs when the PST file in the Windows OS becomes corrupted.. Users of the email programme MS Outlook 2016 can send and receive emails as well as store all of their data in PST files.

While using Outlook, you may come across the Outlook Error 0x80040154, stating “An unknown error has occurred, error code:0x80040154 in Outlook (your version).” This error indicates that the PST file is damaged/ corrupt, accidental deletion of important system files has occurred or there is an installation of some faulty add-ins.

Emails, contacts, calendar events, tasks, diaries, and other items are all stored in the Outlook PST file, also known as the Personal Storage Table. Any MS Outlook version, including Outlook 2016, 2013, 2010, 2007, and others, may be used to create it. When customers attempt to send emails using Microsoft Outlook, the notification “An unforeseen problem has occurred, error code: 0x80040154 in outlook 2016” will occasionally appear.

Common causes of the Outlook error 0x80040154

Reasons for the occurrence of Outlook error0x80040154 can be any of the following stated below:

• Damage or corruption of PST file.
• Malware or viruses.
• Improper installation or corruption or damage in Microsoft Outlook profile.
• The DLL file is not registered.
• Accidental deletion of some important system files.
• You have exceeded the PST file size limit.
• Installation of faulty add-ins.
• Incomplete or improper configuration of the email.

How Do I Fix Outlook Error 0x80040154 on Windows?

Method 1: Unregistered Files Should Be Added

When the inetcomm.dll file is either unregistered or deleted, you will not be able to access PST files, as a result of which occurs the ‘Outlook error 0x80040154.’ The absence of this file leads to this error whenever you try to receive new emails. So all you need to do is re-register the file. To do so follow the steps given:

• To begin, open the Run dialogue box by clicking on the Windows Start icon.
• After that, type regsvr32 “inercomm.dll” and press Enter.
• Restart the computer or system after that.
• On the computer, open the Outlook software. If the error does not appear, the problem was caused by unregistered registry files.

Method 2: Check the Anti-virus Software

Continue to the next step if the aforementioned approach is unable to resolve the issue. The user must first start the computer in Safe Mode before launching the Microsoft Outlook programme in order to accomplish this. If the problem continues, a computer virus can be to for the error code 0x80040154. To fix this, uninstall the allegedly dangerous computer virus-containing software.

Method 3: Repair or Reinstall MS Office

You could also try to repair or reinstall Microsoft Office. These are the actions to take in order to do this:

Step 1: Right-click and choose the Start menu.

Step 2:  Select the drop-down menu’s Apps and Features option.

Step 3:Click Modify after choosing the MS Office product you want to modify.

Step 4:You should check to see if the issue has been resolved after the Office suite repair is finished.

Method 4: Try to run the Outlook application in safe mode

Try to launch the Microsoft Outlook program in safe mode. You need to close Outlook first, then click on it while holding down the Ctrl key to launch Outlook in safe mode. You’ll be prompted to choose whether you want to launch the programme in safe mode. To launch the programme in safe mode, select yes. Check to see if the problem still occurs when you attempt to receive new emails. If this fixes the problem, it is implied that an add-in or an external programme is to blame for the error. You can try to locate and get rid of them.

Method 5: Using PST Repair Tool

Outlook may crash when you try to open an email as a result of faulty PST or OST files. A third-party tool is the simplest solution to resolve any Outlook mistake. Reliable programme to fix damaged PST files is Kernel for PST Repair. They can be exported to Gmail, Office 365, Exchange, and Outlook PST. It can fix PST files of any size or quantity while keeping all the email attributes untouched. Additionally, it creates a new, healthy PST file with the restored items in it.

Method 6 Check if Outlook can run in Compatibility mode.

Go to the following location – C:\Program Files\Microsoft Office\Office <N>\outlook.exe.

Here <N> is the Office version number.

Here, right-click the file and choose Properties > Compatibility.

Now, uncheck “Run this program in compatibility with…” and check if Outlook is working.