You retrieve the body of a message by using Exchange Web Services in a Microsoft Exchange Server 2007 environment. In this situation, a multibyte character that is contained in the body of the message may be converted into a 0xFFFD character or into unrecognized characters. This is done in the response that is returned from a GetItem call that is requesting the HTML body.
This problem occurs because of a conversion process when the message is retrieved by using Exchange Web Services. The characters are stored in buffers during the conversion process. Sometimes, a multibyte character is split into different buffers. Therefore, some parts to be unrecognized. Therefore, this problem occurs.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.