When attempting to parse outlook files that were inadvertently saved as outlook-unicode the mappimessage is created but then cannot find content. MAPIMessage will load fine, but then attempting to get any part of the message via a "getSubject" - or some similar method - returns a org.apache.poi.hsmf.exceptions.ChunkNotFoundException. For "getConversationTopic" the exact error is : org.apache.poi.hsmf.exceptions.ChunkNotFoundException: __substg1.0_0070001E was named, but not found in POIFS object
HSMF has undergone a lot of changes since this bug was opened. Unicode messages can now be read just fine.