The messaging interface returned an unknown error

Solution to the issue of an Unknown error from Messaging Interface

How to resolve the issue indicated by the message 'the messaging interface has returned an unknown error' in MS Outlook PST?

Personal Storage Table (PST) files of Outlook repeatedly may fall victim to many types of corruption due to various internal and external factors. A common symptom of Outlook PST corruption is the display of an error message of the type "the messaging interface has returned an unknown error. If the problem persists restart Outlook." You may receive such messages while trying to check emails, sending faxes, creating a new calendar item and deleting emails, calendar items or contacts. How can you deal with such situations?

Before attempting anything else, restart the Outlook as instructed in the message and check if the problem is still there. If MS Outlook does not work as usual, try the following solutions one after the other to resolve the corruption that is haunting the MS Outlook PST (versions 8.03 to 97): Use Inbox Repair Tool, Create New PST File, Create a New Outlook Profile, Install a New Set of MAPI Files, Reinstall Windows. You can repair the corrupt PST files more easily by using a PST repair tool like Kernel for PST Repair.

Method 1- Use Inbox Repair Tool (scanpst.exe)

Inbox Repair Tool is an inbuilt Microsoft Tool to deal with the PST corruption issues. It can be used as below:


Method 2- Create New PST File

Creation of a new PST file involves creating a new PST file and importing the information from the original PST.


Method 3- Create a New Outlook Profile

Exit Outlook completely, go to Start>Settings and click Control Panel.


Method 4- Install a New Set of MAPI files

Restart the system in MS-DOS mode, install a new set of MAPI files and restart Windows. However, this solution requires some technical knowledge.

Method 5- Reinstall Windows

If all these methods fail, it is essential to reinstall the Windows in the system.

Method 6- Kernel for PST Repair

In order to repair corrupt PST files, you can use a reliable PST repair tool named, Kernel for PST Repair. It is an easy-to-use tool that works with all versions of MS Outlook. Outlook PST Repair tool facilitates the quick repair of PST files without any technical complications. It is known among the Outlook users as the most user-friendly tool and is available as demo version. After repairing the corrupt or inaccessible PST, you can perform all Outlook activities as usual.


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