Top 15 Annoying Outlook errors & their solutions

Teodor Nechita
by Teodor Nechita
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  • Microsoft is one of the world's most well-known email clients.
  • The article below will cover the top 15 most common issues found in Microsoft Outlook.
  • To read more about this practical tool, check out our dedicated Outlook page.
  • If fixing Outlook is what you need, we also have a dedicated Fix page as well.
Microsoft Outlook

Microsoft Outlook is a personal information manager from Microsoft, but you probably know it as the email client that comes with the Microsoft Office Suite.

This software tool is highly regarded by the community, but it also faces its fair share of criticism due to the frequent bugs.

We’ve compiled a list of the most common issues users face when using Microsoft Outlook, as well as the methods used to overcome them.


Common errors in Outlook, and how can I fix them?

1. Error code 0x8004060c

This error usually appears when the user tries to send or receive emails, thus rendering Outlook functionally useless. It is usually caused by oversized PST files that are above the max mailbox storage size for Outlook.

In order to fix error code 0x8004060c, follow this step-by-step guide

2. Error code 0x8004010f

Like the previous error, Error code 0x8004010f also happens when you try to send or receive emails.

Error code 0x8004010f is usually triggered due to corrupted Outlook user profiles. In order to fix error code 0x8004010f, follow our comprehensive guide


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3. Error code 0x800ccc0e

Whenever you get an error code 0x800ccc0e, you know that you are having issues with one of these services:

The error is caused by a conflict between the SMTP servers and when the user tries to send an email without properly configuring their account.

For a list of efficient troubleshooting methods, please refer to this article.

4. Error code 0x80042109

Error code 0x80042109 is yet another error code triggered by users trying to send or receive emails.

This error also appears because of a communication error between the SMTP servers. In order to bypass this issue, please read up on this article for a list of fixes.

5. Error 452 4.5.3 Too many recipients

This error occurs when you try to send an email to multiple recipients, and it happens when a distribution list is too big.

For a list of solutions to this issue, check out this article for more information

6. Error code 0x80042108

This error message appears whenever you try to send or open a message.

Error 0x80042108 can be caused by corrupted PST files, third-party anti-virus or firewall software, Outlook‘s configuration settings or an incomplete installation of Microsoft Office. Check out this guide for more information about it and how to fix it.


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7. Error code 0x800CCC13

Error code 0x800CCC13 is yet another error that appears when a user tries to send, receive or open an email.

This error can be caused by multiple reasons, such as corrupt PSt files, third-party anti-virus or firewall software, an outdated installation of MS Office, etc.

For more information on how to fix this error, check out our in-depth guide.

8. Error code 0x800ccc0f

Error 0x800ccc0f is one that occurs for some users when sending or receiving emails.  Most often than naught error 0x800ccc0f occurs when SMTP emails aren’t sent or received.

In order to fix this issue, head over to our detailed article on the matter.

9. Error code 20

Error code 20 is triggered when users try to send emails. Unlike the previous articles, this one is caused by an inability to communicate with the proxy server.

For more information on how to fix error code 20, check out this article.

10. Outlook client shows a Disconnected message

This issue usually occurs when users try to go back online after working with Outlook in offline mode.

In order to make Outlook appear online again, check out the troubleshooting methods listed in this guide.


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11. An unknown error occurred on Outlook

This enigmatic error is triggered when sending, receiving, opening or deleting emails. While not exclusively, it is usually caused by a corrupted PST file.

For a complete guide on how to fix this unknown error, follow this article.

12. The operation failed. An object could not be found

Like most other errors on this list, this error occurs when you try to sending, replying or forwarding emails.

The list of solutions is quite small, and they can be found in this quick guide of ours.

13. The modified permissions cannot be saved

This issue happens when trying to edit the permissions on a shared calendar, and it is also triggered when trying to remove an old entry from the list of users.

For a detailed guide on how to fix these issues, check out this comprehensive guide.

14. Outlook won’t open in Windows 10

This issue is pretty self-explanatory, as sometimes Outlook will simply refuse to launch in Windows 10.

In order to quickly fix this bug and make Outlook launch again, head over to this step-by-step article.

15. Outlook cannot log on

This error is similar to the previous one, only that Outlook does launch, but refuses to log in.

Most of the solutions revolve you managing your profile in one way or another. For a detailed guide on how to fix this troublesome error, head of to this dedicated guide on the matter.


FAQ: Learn more about Microsoft Outlook

  • What is Microsoft Outlook?

Microsoft is a personal information manager and email client developed by Microsoft.

  • What can I use instead of Outlook?

There are plenty of other personal information managers on the market besides Outlook, some of which may suit your taste better.

  • Is Outlook free?

Yes, Outlook is 100% free and can be downloaded separately from Office 365.