Messaging interface has returned an unknown error

Posted on 2007-07-31
Last Modified: 2009-09-13
I am running Outlook 2003 on a machine with Windows XP SP2. It has been running with no problem until yesterday when an error, 'messaging interface has returned an unknown error. Try restarting Outlook.', pops up when I try to create, reply to or forward a message. I have uninstalled and reinstalled the Office suite, all updates have been run for both Office and Windows, spyware and virus scans have been run, the hard drive has been defragmented. No new software has been installed recently.
Any help would be appreciated.
Question by:hsaks
    LVL 97

    Accepted Solution

    Greetings hsaks !

    1. Reset the Outlook toolbar template. With Outlook close, do a search for and rename outcmd.dat file. Do the same for frmcache.dat and outprnt files. Restart Outlook.

    Outcmd.dat is located in C:\Documents and Settings\<user>\Application Data\Microsoft\Outlook folder. It is a hidden file, so you have to unhide hidden files. Go to any folder and select Tools > Folders Options > View. Check "Show hidden files and folders". Click OK.

    2. If no joy, register two important Outlook files. Go to Start > Run and type regsvr32 OLE32.DLL
    Do the same for INETCOMM.DLL

    3. If no joy, an addin could be interfering. Disable Outlook Addins.  Go to Tools > Options > Other > Advanced Options > Addin Manager or COMM/Addins and disable the addins.

    4. Check if an external program running in the background is interfering with Outlook. Check Firewall, antivirus, antispyware, antispam, and all Norton programs. Disable these programs one at a time.

    5. If no joy, create a new Outlook profile.

    Best wishes, war1
    LVL 97

    Expert Comment


    Your PST file may be corrupt or full. Repair Damaged Outlook PST File
    Outlook Recovery Toolbox

    If you are using an older version of PST formatted file, it would have a 2 GB limit. Repair a 2GB Outlook Personal Folder

    Author Comment

    Creating the new profile did it. Thanks
    LVL 97

    Expert Comment

    You are welcoem, hsks!

    Expert Comment

    War1: Solution number 2: If no joy, register two important Outlook files. Go to Start > Run and type regsvr32 OLE32.DLL; Do the same for INETCOMM.DLL
    worked for me.

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