How to Fix Outlook an Unknown Error Occurred 0x8000ffff?

How to fix Microsoft Outlook an unknown error occurred 0x8000ffff? Read the guide below and explore effective ways to resolve Outlook an unknown error occurred 0x8000ffff.

Apr 07,2020 • Filed to: Recover & Repair Emails • Proven solutions


No doubt, encountering errors in Outlook is maddening as work completely gets disturbed. Indeed, you are just left looking for effective methods to resolve the error message. One common error that users experienced in Outlook is 0x8000ffff. If you’re wondering what could be a possible reason to encounter such annoying Outlook error, then you’re in the right place. In this post, we’re going to walk you through causes and how to resolve Microsoft outlook an unknown error occurred 0x8000ffff effectively.

Part 1: Causes of Outlook an Unknown Error Occurred 0x8000ffff

You would encounter this Outlook unknown error 0x8000ffff while adding a data or PST file in the Mail applet. It is quite a common error experienced by many Outlook users. If you’re wondering what could be the culprit behind facing such annoying errors, then it may be one of the followings:

No matter what cause is, continue reading to fix Outlook an unknown error occurred 0x8000fff.

Part 2: How to resolve Outlook an unknown error occurred 0x8000ffff?

The following are the recommend workarounds to fix the Microsoft Outlook an unknown error occurred 0x8000ffff without much hassle.

1. Add the data file in Account Settings

If you encounter this error while adding a data file in the Mail Applet in Outlook, then we suggest you try the below steps to come out of this annoying issue.

Step 1: To commence the process, launch Outlook 2016.

Step 2: Go to the “File tab”, tap “Account Settings” and after that, tap “Account Settings”.

Step 3: Go to the “Data Files” tab and then click on the “Add”.

Step 4: Now, you can add the data file as required and then hit on “Ok”.

Step 5: Click on “Close” on the Account Settings and that’s it.

account settings

If still encounter the error message, then it simply means that the Outlook data file that you are attempting to add is damage or corrupt. No worries!! Continue reading to learn what to do in this scenario.

2. Using Outlook Inbox Repair tool

If you are not able to fix the error using the above method, then it’s time to take advantage of the Outlook Inbox Repair tool for scanning the Outlook data file. The Outlook Inbox Repair tool, also known as scanpst.exe utility, is an in-built repair tool in the Microsoft Outlook client. With the help of it, you can repair the PST file that is damaged due to some unknown reason.

Below is the step-by-step guide on how to Use Outlook Inbox Repair tool:

Step 1: To start with, use “Windows Key + R” in order to open the Run dialog box.

Step 2: Enter the below path and hit on the “Ok” button.

“C:\Program Files (x86)\Microsoft Office\root\Office16”.

Step 3: Double-tap the “SCANPST.EXE” file to run the Microsoft Outlook Inbox Repair tool.

Step 4: Click on the “Browse” button and find the .pst file that you would like to repair. Then, click the “Open”>” Start” button.

Step 5: Make sure to check the option that says “Make a backup of scanned file before repairing” and click on the “Repair” button.

browse path

In a while, the Outlook Inbox Repair tool will repair your .pst file. Once repairing it successfully, you can open Outlook and the problems with it should now be fixed.

3. Try the third-party Outlook repair software

None of the above methods worked to help you fix Microsoft Outlook an unknown error occurred 0x8000ffff? If so, you certainly need a more powerful solution and it is Stellar Outlook Repair.

Stellar Outlook Repair comes in handy when it comes to repairing the PST file. Indeed, this tool is one of the ultimate recovery solutions out there for Outlook users. With the help of it, you can repair the PST file effortlessly and restore your mailbox data from it. What’s more? It is the best PST recovery solution for Outlook 2019/2016/2013/2010 and older versions as well.

Get the 3rd-party Outlook repair tool - Stellar Outlook Repair from its official site on your computer and then follow the below steps to learn to use it t repair PST file:

Step 1: Add PST file

Run Stellar Outlook Repair. From the Home tab, choose “Outlook PST” and click on the “Browse” button to add the PST file. Once adding the file, click on the “Repair” button. Or if you don’t the exact location of your PST file, then click “Find” and the software will find the file.

add pst file

Step 2: Repair the PST file

Once you click the “Repair” button, the software will scan and repair corrupt PST file. Let the software complete the scan process.

repair file

Step 3: Preview and save

The software lets you preview restored Outlook mailbox data in the Left pane. Select the mailbox data by choosing the individual folders and hit on the “Save Repaired File” option in the Home tab. Finally, choose PST as a file format and tap “Browse”>” Ok” to save the restored PST.

preview save

The Bottom Line:

That’s all on what to do to resolve Microsoft Outlook an unknown error occurred 0x8000ffff. The common workarounds will probably help you fix this error. However, if nothing works, then the Stellar Outlook Repair role comes in. Indeed, we even highly recommend you give Stellar Outlook Repair a try as it will help you repair the PST file and recover the mailbox data in no time.

Amy Dennis

staff Editor

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