Do not call IMessage::SaveChanges; let OOM handle that (MailItem.Save) - you
just need to trick Outlook into thinking that it' been modified - something
like the following will do:

MailItem.Subject = MailItem.Subject

Dmitry Streblechenko (MVP)
http://www.dimastr.com/
OutlookSpy - Outlook, CDO
and MAPI Developer Tool

"tonyl" wrote in message
m...

I am able to catch the itemsAdd. itemsChange event. I try to add some
customized properties in that item using the IMessage by calling
item.get_MAPIObject((IUnknown **)&spIMessage) .
After made the changes within the itemsAdd/itemsChange event, I use
IMessage-SaveChanges(0), and IMessage-Release() (if IMessage is not
CComPtr, I call release).
- When I use the outlookspy to check my properties from the outlook main
window, it exists.
- When open that item window, the inspector, and check the imessage
properties, they all exist.
- When I made some changes on the item, eg. add comments, and click save
button, a popup window prompt that:
"Your changes could not be saved because you don't have permission to
modify some or all of the items in this folder. Do you want to save a
copy of this item in the default folder for the item?" YES/NO

How can I solve this? because from OOM, no API let me add the customized
properties (customized named properties), therefore, I call get_MAPIObject
and use MAPI call instead.

Regards,
Tony