Answered
I have a lifecycle form, run it through the reader extensions so that users can use the "submit" button in Adobe Reader. Some users get "The form cache file 'C|\WINDOWS\FORMS\FRMCACHE.DAT' is not valid. Contact your administrator." error when they press submit button. Why?
The form cache is a property of Outlook, not Acrobat. This message is displayed when the form cache is corrupted. And it doesn't really have anything to do with sending email. It seems unlikely that you could have put in anything in the submit button that would cause Reader corrupt the cache. But lots of other people have had problems with this file.
Here's a form thread on it:
http://www.eggheadcafe.com/forumarchives/outlookgeneral/Oct2005/post24980382.asp
Here's an article from Microsoft of fixing the cache file:
http://support.microsoft.com/kb/195754
Thom Parker
The source for PDF Scripting Info
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The Acrobat JavaScript Reference, Use it Early and Often
[url=http://www.adobe.com/devnet/acrobat/javascript.php]http://www.adobe.com/devnet/acrobat/javascript.php[/url]
Then most important JavaScript Development tool in Acrobat
[url=http://www.pdfscripting.com/public/34.cfm#JSIntro][b]The Console Window (Video tutorial)[/b][/url]
[url=http://www.acrobatusers.com/tutorials/2006/javascript_console][b]The Console Window(article)[/b][/url]
Thom Parker
The source for PDF Scripting Info
www.pdfscripting.com
Very Important - How to Debug Your Script