Here's how to fix it
- An unknown error has occurred in Outlook occurs when you're trying to send, receive, open, or delete emails. It can include 0x80040119, 0x80040600, 0x80070057, 0x800CCC67 and other codes.
- A virus might have corrupted the Outlook data files. That's more likely if your third-party anti-virus software needs updating.
- You may also have corrupt PST files in which case you will have to repair them.
- See below how to do these things along with other useful tricks and get back to using your email as soon as possible.
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An error occurred in an error message that happens for some Outlook users when sending, receiving, opening, or deleting emails.
That error message more specifically states An unknown error has occurred.
The error can include 0x80040119, 0x80040600, 0x80070057, 0x800CCC67 and other codes, and it is usually due to corrupted PST files.
Here are a few tips that might fix the unknown error has occurred issue or an unexpected error has occurred annoying message from Outlook.
How can I fix An unknown error has occurred on Outlook?
1. Run an Anti-Virus Scan
A virus might have corrupted the Outlook data files. That’s more likely if your third-party anti-virus software needs updating.
First, check that your anti-virus software is updated; and then run a scan with the utility.
You can usually select a check for updates option within most anti-virus utilities to update the software.
For example, Avast has an Update option on its system tray context menu.
If you don’t already have a third-party utility installed, check out this software guide. Most of the more effective anti-virus utilities also have freeware versions.
Alternatively, you can utilize the Windows Defender app in Windows.
2. Fix Outlook with third-party utility software
There are numerous third-party utility applications with which you can repair Outlook’s PST files. The one that comes highly recommended is Stellar Repair for Outlook.
Fixing your PST file is easy. Once you download and install the software, you select the PST file from your computer. Then start the process by clicking the Repair button.
The software then provides a preview of the repaired PST file items. You can press a Save Repaired Files button on the Home tab to save the scan the details.
The software can recover not only emails, but calendars, contacts, notes, and attachments.
Hence, all that remains to be done is to try the tool for yourself and recover your Outlook benefits right away using the handy solution Stellar File Recovery Tool
3. Temporarily switch anti-virus software off
Switching anti-virus software off might be a good fix for unknown errors with the 0x800CCC67 code. In which case, an anti-virus utility might be blocking the SMTP protocol.
Most anti-virus utilities include a disable option of some kind on their system tray context menu.
As such, right-click the anti-virus software’s system tray icon and select the disable option to switch the utility off.
Then try sending an email from Outlook again to see if that fixed the issue.
4. Remove Microsoft Outlook add-ins
Add-ins can generate numerous Outlook errors. As such, removing the add-ins off might also fix unknown Outlook errors. This is how you can remove add-ins from Outlook.
5. Set up a new Outlook Account Profile
Your Outlook profile might be corrupted. In which case, setting up a fresh new account profile in Outlook could feasibly fix the unknown error.
This is how you can set up a new Outlook profile.
6. Fix Corrupted PST Files With the Inbox Repair Tool
Fixing corrupted PST data files is one of the best general fixes for unknown errors in Outlook.
Thus, Outlook includes an Inbox Repair Tool, otherwise, Scanpst.exe, to repair PST files. This is how you can scan a PST with that utility.
7. The Outlook 2010 Hotfix Package
This fix is more specifically for unknown errors with a 0x80070057 code, which usually occurs when you try to set up new profiles with the Auto Account Setup process in MS Outlook 2010.
Microsoft has a hotfix package for the 0x80070057 error. However, don’t expect that hotfix to fix any other unknown error.
You can save that hotfix package to Windows by pressing the Hotfix Download Available button on this website page.
Then enter an email address so that you can receive an email that includes a download link and password for the hotfix.
Run the hotfix exe, enter the required password, and restart Windows after the hotfix weaves its magic.
Those are some of the best resolutions for Outlook’s unknown error has occurred error messages.
If further fixes are still required, check out the Support and Recovery Assistant for Office 365 that can also resolve numerous MS Outlook issues.
Start writing the address that shows incorrectly. Press the down arrow key to select an autocomplete addressing delete it. If that doesn’t work, you can follow our step by step guide to fix this problem completely.
You can try to check if Outlook is running in compatibility mode. Remove the checks for any boxes on the Compatibility tab in Outlook Properties. Restart Outlook for the changes to take effect.
8. Try a new email client
If you are tired of unknown Outlook errors and corrupted PST files, we recommend switching your email client.
Mailbird is one of our favorite alternatives to Outlook. Developers are constantly working on it, bringing new features.
You can add multiple email accounts in Mailbird and have a bird’ eye view with the unified inbox. Here’s what else is great about it.
- Emails that don’t require immediate attention can be snoozed.
- Perform searches through all your attachments.
- Lookup your contacts and connect with them directly via LinkedIn.
- Integration with Google Calendar, Dropbox, Facebook, and more.
All this is great, but what really sets it apart is the free 24/7 support that you receive as a client.
We have a full list of Outlook errors and the solutions to them in our Outlook troubleshooting section.
Errors are not the only thing that can happen to Outlook, so if you have any other problems with it, check our Fix Outlook hub for answers.
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