Answered at http://www.outlookcode.com/threads.a...essageid=24849

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Sue Mosher, Outlook MVP
Author of Microsoft Outlook 2007 Programming:
Jumpstart for Power Users and Administrators
http://www.outlookcode.com/article.aspx?id=54


"AlanGlover" wrote in message ...

I've discovered that the error is caused by my form being regarded as a "One
- off". This actually occurs when I add a userproperty to the item. You can
tell this has happened because the item.MessageClass changes from
"item.appointment.myform" to "item.appointmentItem". So you can't add
userproperties.

I still need to find a way to mark the item temporarily as having been
drag-dropped so my item_Open code can perform a different action from the
normal open. Any ideas how I can do this?