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Outlook Fatal Error | The Comprehensive Guide

  author
Jubith Paloth   
Published: Mar 24, 2023 • Outlook • 5 Min Read

We know that Outlook PST corruption took a major role in Outlook workflow but this is not the single reason for Outlook unresponsiveness. Outlook Network problem can also lead you to some error such as Outlook fatal error or fatal error 0x80040900.

Moreover, if you are facing the same error in your Outlook program and want to fix it, then here in this blog we are going to discuss the reasons along with a solution to fix Outlook fatal error. But before going toward the solution let’s understand what is fatal error 0x80040900 in Outlook.

What causes Fatal Error 0x80040900?

As we all are aware that Outlook gives the option to configurable the different email services, and also you can sync web email accounts like Gmail, Yahoo, AOL, iCloud, etc. And you can set up your email account in Outlook either with IMAP or POP configuration, for which you only need details regarding the email server.

Now, if we talk about the email server for different email clients is also different. Hence, it is important to make sure that the email server is configured with the right settings. Otherwise, you may encounter Fatal Error: 0x80040900 message out of nowhere. Moreover, always confirm the following details are configured correctly.

  • Incoming Mail Server Type IMAP or POP3
  • Incoming Mail Server Name/Address
  • Outgoing Mail Server Name/Address
  • Incoming and Outgoing Mail Server Port Number

How to Fix Outlook Fatal Error Manually?

#Solution 1: Reset Firewall and Antivirus Settings

There are many Antivirus program gives an option of email scanning feature which may become the reason for fatal error in Outlook. So, check out if your antivirus offering the email scan feature, then disable email scanning. If the issue you’re facing is not because of it, you can disable the option and check if the issue persists.

In Firewall Settings, check if either Outlook or the Ports it uses are blocked or not, as per the settings.

1. First, click on the Start button.

2. Now, type Control Panel and press Enter.

3. After that click on the on System and Security and select Windows Firewall.

4. Now, click on the Advanced settings.

5. Here, check for Blocked/Unblocked Ports in both Inbound & Outbound Rules.

#Solution 2: Check Internet Connectivity

This is one of the most common reasons for Outlook fatal error. Because an unstable Internet may also cause the same error to happen. Now to fix this check your ISP or restarting the router would help.

#Solution 3: Repair Outlook PST FIle Using Scanpst.exe to Fix Fatal Error 80040900

We know that if you configure your Outlook account in POP settings, then Outlook will store all the mailbox data on your computer either at the default or specified location which includes emails, attachments, reminders, calendar details, etc.

With all the positives there are negatives too, associated with the Outlook PST data file. The chances of PST data file turning corrupt or getting damaged are quite common, and there are many reasons behind that can lead to such situation, and data inside Outlook PST file comes on the verge of loss.

Well, there are a couple of things you may think of as the solution to fixing the error, which includes both manual and automatic methods. One is SCANPST.EXE which is the built-in utility provided by Microsoft. Using the SCANPST utility you can try to fix the PST file error you are facing.

Limitation of the SCANPST

The built-in utility has some limitations as the tool is available to you free of cost. But we have to understand that time and data is more important then money.

  • The utility can’t proceed with repairing large-size PST files exceeding 2GB.
  • If viruses or Malware infects the PST file, SCANPST cannot fix that issue.
  • If directory structures & headers of Outlook PST file(s) are broken, then the utility can’t fix it.
  • The utility may stop working in situations when the processing load is excessive.

Best Solution to Repair Outlook PST Corruption

The Scanpst may be the tool that you should try straight when you encounter the Fatal Error: 80040900. But in the case of major corruption of PST files, then this method is not going to work.

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There is nothing you can do with the SCANPST tool if the scale of corruption is dramatically high or the PST file got damaged because of the influence of virus or malware. So to overcome this situation you can try the SysTools Outlook Recovery Tool. It is one of the best ways to repair Outlook file corruption. Let see some advance feature of the tool.

Also Read: Top 3 Outlook PST Recovery Tools of the Year 2019 – Microsoft Experts Review

Advance Features of the Tool

  • Outlook PST Repair is amongst the best & advanced tools for fixing all the errors or issues, which you may encounter with Outlook PST data file(s).
  • With RecoveryFix for Outlook PST Repair, you can repair the corrupt or damaged PST data file(s), irrespective of the intensity of corruption or how badly the data file(s) is damaged.
  • The tool provides an unconditional repair process of the Outlook PST tool, and further you can recover the mailbox data.
  • Maintenance of data structure and hierarchy, no restriction on file size

Conclusion

There are many Outlook users facing Outlook fatal error. But due to a lack of knowledge, they are not able to fix the error. So after considering the users requirement here in this blog we have discussed the best way to fix the 0x80040900 fatal error in Outlook

By Jubith Paloth

Jubith Paloth is a versatile professional known for his roles as a Data Analyst, Digital Marketing Consultant, and Content Strategist and Curator. Jubith's multidimensional expertise makes him an indispensable asset in the digital landscape, bridging the gap between data analysis, content curation, and marketing success. His knack for curating and strategizing content ensures that brands engage and resonate with their target audiences effectively.