Exception at item display

Hello,

I am developing a C# addin for Microsoft Outlook 2002 and 2003. This addin
creates and manipulates items using custom forms. Items are created in the
standard drafts folder and then displayed with "item.Display(false)" call.

On one of the test machines (Outlook 2002 SP3, XP SP2, MS Exchange account,
no local PST files) the following exception occurs (100% reproducible):

System.Runtime.InteropServices.COMException (0xDEE7007E): The messaging interface
has returned an unknown error. If the problem persists, restart Outlook.
at Outlook._MailItem.Display(Object Modal)
....


Does anybody know what the problem can be?

---
Yury Kudryashov