The Messaging Interface has returned an unknown error

Posted on 2011-10-26
Last Modified: 2014-04-03
I have a VIP at Timken, Vice President actually who has an oversized pre-2003 PST file.  Limit is 2GB i know, and he is at 199999 nearly.  THe PST needs to be exported and / or archived to a new PST. (2003 or higher), with a size limit of 20gb.  

I cant access any of his pst data once i ran the scan pst file to fix his pst.  I always get the following message when trying to open folders within the PST:

"The messaging interface returned and unknown error.  If the problem persists, restart outlook."

I have restarted outlook as you may have guessed, and also rebuilt his Mail profile.  

We have a backup of the pst if that needs to be recovered, but i fear the same will happen with the restored data.  Please advise and know i have ran the SCANPST.EXE twice on the pst file already.  

Regards -

Stephen Ripple
Timken Company.  
Question by:ripplest
    LVL 12

    Expert Comment

    by:Deepu Chowdary
    Which OL version are you using..?
    Check for the available hotfixes, if any

    Author Comment

    Outlook 2007 SP 1  
    XP Pro SP3

    Hotfixes are automatically applied through SMS, everything is patched accordingly.  My guess is since the PST in question is the only one returning the error, it is not an issue with the client, but one with the data file.  
    LVL 12

    Expert Comment

    by:Deepu Chowdary
    Yes you can try repairing the pst once..
    LVL 47

    Accepted Solution

    If you have a backup of the working PST....
    make a copy of it
    Copy it to your local PC

    In your OUtlook Create a New UNicode Personal Folder
    Call it VIP Restored

    Once created in your oultook
    GO to File Import/Export
    Import a PST file
    Navigate to the Copy of the pst on your local pc
    Select it for import into the new one you created

    Then just let it run....

    Once compelte
    Rename the backup and put is somewhere for safe keeping
    Then close the new one you created
    Copy it to the VIPs local PC

    Then open the PST via the VIPs Outlook Client

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