Last reviewed on January 17, 2013   —  5 Comments

Problem: after importing messages from Windows Mail to Outlook, you receive the following error message when reading email:

The custom form cannot be opened. Outlook will use an Outlook form instead. The object could not be found.

This shows up with each message imported into Outlook 2010 from Windows Live Mail. After clicking OK the popup disappears and you can read the email, but the popup is annoying.

Fortunately the fix is fairly simple: You need change the form (message class) associated with the messages to the IPM.Note. To do this, download DocMessageClass and run it on the Inbox (and any other affected folders).


  1. Trevor Waters says

    Thank you so much! I was banging my head against this and had tried clearing the Outlook forms cache, removed and reinstalled Office, deleted and re-imported the email and I couldn't get this issue to go away. Thanks again for this wonderful program!

  2. Javier says

    When i try to collapse the categories in outlook 2013 shows up the same message
    "The custom form cannot be opened. Outlook will use an Outlook form instead. The object could not be found."
    I am using (Contacts - iCloud) Outlook 2013
    Please HELP Thank you so much

    • Diane PoremskyDiane Poremsky says

      I'm not able to repro it - so I'm guessing the form is corrupt or something.
      Do all of the appointments have the little calendar icon? (some may have people or recurring overlay in the corner) iCloud should use the standard ipm.appointment form (mine does).

  3. Albert Nijdam says

    Thank you very much. This solved my problem. After a crash of windows live mail 2012 I managed to import most of mail folders into outlook 2010. I did not use outlook because I was used to WLM. The move worked, only I got a very annoying window complaining about forms which could not be found. Not any more. Thanks again.

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