Currently, creating a regular message fails in Outlook, or even MFCMAPI.
The error is reported relating the the IPersistMessage interface.
Possible related issues include...
1. Some unsuported functions return MAPI_E_NO_SUPPORT
instead of E_FAIL.
2. PR_CONTENT_COUNT property is not changed if new meaasage is created
so it is always 0 that prevents Outlook to show the folder content.
(Outlook does not call QueryRows (may be that will work under Outlook
XP but Outlook 2003 fails))
3. Quering for identity from MAPISession returns some trash value. So OpenEntry fails.
This needs to be tracked down and fix.