Occurring of unknown errors while reading Outlook in-box is caused due to severe damage or corruption to PST files. These PST files are the repository of all important data of Outlook by the users including emails, notes, tasks, contacts, journals, attachments, appointments, etc. when these files get damaged or corrupt, user can come across a condition where he could not access its contents and lead to data loss. In order to avoid such data loss situations, it is recommended to create backup of those PST files regularly at least once a week because these backup files are considered as the most efficients method to restore the PST files to an earlier state against data loss.

If you are using MS Outlook 2007, 2003 or other versions, then it is likely to occur unknown errors while reading data from Outlook in-box anytime if some unfortunate conditions strike the PST files. In such situations, you may come to face following error messages:

An unknown error has occurred. 0X80040119

OR

An unknown error has occurred. 0X80040600

Above given error messages should be resolved as quick as possible, other wise it can cause to many further issues. If your MS outlook 2007 is prompting with “Unknown error occurred while reading outlook in-box”, then go through the solutions mentioned below:

Solution 1 - Use free in-box repair tool or Scanpst.exe file to repair damaged PST files. This tool is provides by the MS outlook 2007 and is very useful to restore the PST files easily.

Solutions 2 - However, the free scanpst.exe file can fail to repair the PST files if the PST file size exceeds 2 GB limit. In such a case, use a trusted PST repair third party tools to repair the damaged PST files in order to recover the data loss. These tools are designed with the implementation of powerful algorithms that are capable to resolve any severe errors in PST files.

Resolving "Unknown Error Occurred While Reading data from Outlook In-box" with free Inbox repair tool is quite easy and efficients. But if this utility fails to solve the problem anyhow, then using a third party PST repair software is the best and easy option available.