For example, a best body format that is defined by the PR_NATIVE_BODY_INFO property is set to "HtmlBody (0x03)." This setting corresponds to the PR_HTML property of the message body. If a request is then made to change the PR_RTF_COMPRESSED property, the request to save the changes fails if the message body is too large.
Note This is a known problem that affects Symantec Enterprise Vault. In this case, the plain text body updates correctly. However, the RTF body returns the MAPI_E_NOT_FOUND error message.
For example, if the HTML body is stored, and an RTF body is requested, Exchange converts the HTML body to RTF, and it returns a ReadOnly stream. Because the PR_RTF_COMPRESSED property does not actually exist in the store, the store returns a MAPI_E_NOT_FOUND error message when Outlook tries to access it in read/write mode.