The custom form cannot be opened. Outlook will use an Outlook form instead.

Last reviewed on January 17, 2013   —  1 comment

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).

About Diane Poremsky

Diane Poremsky
A Microsoft Outlook Most Valuable Professional (MVP) since 1999, Diane is the author of several books, including Outlook 2013 Absolute Beginners Book. She also created video training CDs and online training classes for Microsoft Outlook. You can find her helping people online in Outlook Forums as well as in the Microsoft Answers and TechNet forums.

Please post long or more complicated questions at Outlook forums by Slipstick.com.

One response to “The custom form cannot be opened. Outlook will use an Outlook form instead.”

  1. Trevor Waters

    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!

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