COMException: Exception from HRESULT: 0x80040305

Question

We have an applicaton which exports the content from exchange server(using outlook) to the XML, we used Redemption for this purpose and everything seems to be fine. But currently we are encountering a COMException as follow:

COMException: Error in IMAPISession::OpenEntry: MAPI_E_TOO_BIG at Redemption.RDOMailClass.get_Subject()

What might be the cause for this kind of excetpion? Is this a Redemption Related or Outlook Related Exception?

Answer 1

This is an indication that you open too many objects without releasing them.

Avoid multiple dot notation and release all Redemption objects as soon as you are done with them using Marshal.ReleaseComObject().