“An unknown error has occurred. Account: ‘Example’, Server: ‘example.mail.domain.com’, Protocol: POP3, Port: 110, Secure (SSL): No, Error Number: 0x800C0133 “
When you try to receive your email from outlook express, an error message “An unknown error has occurred. Account: ‘Example’, Server: ‘example.mail.domain.com’, Protocol: POP3, Port: 110, Secure (SSL): No, Error Number: 0x800C0133 ” display on screen. What wrong with the outlook express?
Besides, your outlook express also will have the following symptoms :
All the mail disappear
Unable to download emails
E-mail message could not be sent.
Before i do any research on this problem, i also did some troubleshooting on outlook express like check the pop3 & smtp port, internet connection problem and etc. All the configuration and connection seems ok. So, what wrong with the outlook express?
After i did some research and troubleshooting, these error occur because of the corrupted Inbox or .dbx file.
The main reason cause inbox or .dbx file corrupted is too many email on inbox or specify folder. According to Microsoft, the maximum file size of the .dbx files that are used by Outlook Express is 2 gigabytes (GB).
In this case, my inbox has been corrupted. I try to access to outlook express store folder and check my indox.dbx file size. The file size more than 2GB.
To resolve this problem, there are 3 possible solution:
1st Solution 
elete some of your emails
2nd Solution: Create a new folder or new inbox to move some of your emails to the new folder you have created.
How to do that, follow the steps:
- Create the new folder inside Outlook Express called oldinbox, just move all the inbox email to this new folder called oldInbox
- Find the location of Outlook Express store folder (Tools-> Options -> Maintenance” tab > Click “Store Folder”)
- You may copy the location and paste it in the “Start” > “Run”
- Click OK to access to store folder
- After that, just delete the “inbox.dbx” and Restart the Outlook Express, This creates a new inbox.dbx file automatically.
If you follow the steps, your Outlook Express should be back to normal. 
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