[Resolved] Outlook an unexpected error has occurred 0x80040154 – 5 Methods

Many users encounter Outlook an unexpected error has occurred 0x80040154 while working with Outlook on Windows operating system. If you are also one of them then in this blog you will get the solution.

In this article, you’ll find the entire details about this 0x80040154 error code Outlook 2016, 2013, 2010, 2007, 2007, etc. You will get to know about the reasons for the occurrence of the error along with the resolution methods.

Let’s get started on!

What is this Outlook 0x80040154 Error Code Mean?

When the users try to send emails messages using MS Outlook, then ‘An unknown error has occurred, error code: 0x80040154 in Outlook 2016’ message appears. The most common cause for every Microsoft Outlook error is the PST file corruption. As we know the Outlook application stores its entire data in a PST file format. The Personal Storage Table is an Outlook data file that contains all the Outlook mailbox items like emails, contacts, calendars, tasks, journals etc.

The primary cause of this Outlook PST file error is the inetcomn.dll file. If the DLL file gets erased or lost from the Outlook program, then the .pst files become inaccessible. As a result, the Outlook data files get corrupted due to this Outlook an unexpected error has occurred 0x80040154.

Why an Error Occurred while Sending the Message 0x80040154?

Additionally, there are several other factors that are responsible for this error 0x80040154 Windows 10. Let’s have a look at them.

1. Corrupt Windows Registry File.
2. Virus attack or malicious infection on the Windows System.
3. Accidental loss or deletion of inetcomn.dll files from Microsoft Outlook.
4. Corrupt or damaged PST files.
5. PST file size exceeds its file size limit.
6. Improper installation of MS Outlook profile.
7. Incomplete configuration of Microsoft Outlook.

How to Fix Outlook an unexpected error has Occurred 0x80040154?

1: Manual Technique to resolve Outlook 2007 error code 0x80040154.

2: Professional Solution to mitigate the unknown 0x80040154 error.

Manual Approaches to Troubleshoot the Outlook 0x80040154 Error Code

In order to resolve the ‘An unknown error occurred error code 0x80040154 Outlook, users need to follow the guidelines sequentially.

Method 1: Add Unregistered DLL Files

As we have already mentioned above, the root cause for throwing this error code is due to unregistered .dll files. Follow the steps to re-register the intercomm.dll in Windows:

1. Initially, click on the Windows Start icon and open Run dialog box.
2. Type “ regsvr32 inetcomm.dll” and press Enter key.
3. Restart the system and launch Outlook.

Now, check whether the issue is resolved or not. If you are not getting the error, then this means that issue is with unregistered registry files. However, if you are still getting the error use the below tricks.

Method 2: Disable the Add-ins or Anti-virus Software

In order to check the Antivirus is working properly or not the user needs to start the computer in Safe mode and launch the Microsoft Outlook program.

1. Press ctrl+R to open the run window.
2. Type “outlook.exe / safe” and press enter.

If the error still appears, then the problem is likely related to an add-in or an external program such as an anti-virus software installed on your computer.

Therefore, it is required to uninstall the suspected program that contains harmful viruses.

Method 3: Repair or Reinstall MS Office

Another method that you may try is to repair or re-establish the MS Office. Following are the steps that are required to do so:

Note: Make sure to have a back-up file of data before starting the process.

1. Right-click on the Start menu.
2. Select the Apps and Features option available from the list.
3. Now, choose the MS Office product you want to repair and click on Modify. The Office suite repair will initiate, and once the process finishes, check if the problem is resolved.

Method 4: Create a New Outlook Profile

Sometimes by creating a new Outlook profile prevent it from getting any Outlook error. To make a new MS Outlook 2010 account, move all of your old profile data into the new Outlook profile.

Even if you are receiving the Outlook unknown error code 0x80040154, then it means that your Outlook PST file is completely broken and damaged. In that case, you need to repair the corrupt file using the third-party software.

Methods 5: Fix “Outlook an unexpected error has occurred 0x80040154” due to Corruption

If you face this error due to corruption therefore, in the section, we come up with a reliable and efficient solution.

Outlook PST recovery utility is an advanced tool that can easily fix “an error occurred during activation 0x80040154’ caused due to corrupt PST file. The tool can easily recover corrupted / damaged / unreadable / inaccessible data files in a few clicks.

In addition, the software can recover any accidentally deleted data items into PST, HTML, EML, MSG, and Office 365. Also, maintain the original hierarchy of emails and keeps the meta-data properties intact.

A Final Note

This blog covers the most frequent error – “Outlook an unexpected error has occurred 0x80040154” code in Windows 10, 8, 7 OS. This unknown error may occur for a number of reasons.

Therefore, in this post, we have mentioned some manual solutions that can fix this error code 0x80040154 Outlook 2016, 2013, 2010, 2007, 2003.

Sometimes these tricks do not resolve the issue, in that case, we suggested to use a professional solution. That will help you to overcome this error.