Cannot access the Form Editor

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Outlook version
Outlook 2010 64 bit
Email Account
Exchange Server
I deleted a user defined field in one custom Business Contact Form, and now I cannot open the form editor for any form!

Whether I am in a record and try to click the "Form Layout" button, or I go to File-Business Contact Manager-Customize Record Types-(pick any form)-Customize Form, I get a pop-up box that says "Business Contact Manager for Outlook could not complete your last action or actions. Please try again."

Here's how it happened: I had originally created a user defined field X in in a custom Form that was based on Business Contact. I subsequently also incorporated user defined field X into the standard Business Contact Form. Today I deleted user defined field X from the custom form. Now, the General page of any Business Contact record is totally whacked.

I assume that the standard Business Contact form is looking for a now non-existent user defined filed X in the custom form. Problem is, I can't get into the form editor to fix, revise, revert, or whatever. This includes for an Account, which does not even look for user defined field X.

I tried to create a new custom business contact form to try to open the form editor, and got an error message with details that included :

System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.

at System.ThrowHelper.ThrowKeyNotFoundException() ...

Any ideas for getting into the form editor, or otherwise undoing today's deleted user defined field? Or adding something into the dictionary, which is frankly way beyond me.


Senior Member
Outlook version
Outlook 2010 32 bit
Email Account
Just had this happen to me today.

Granted, I should have been testing my new form customization in a dev VM rather than my production environment... but alas we have always done our form customization in our live environment. Has never been a problem until now... of course we weren't deleting fields before.

We'd lose about 2 days of work from ~15 employees if we were to roll back. Hopefully someone here has some hints as to how to fix this!
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