1、View community message history
Click "History" at the chat box of community. The recent message history of the community will be showed beside the chat box.

Or right click the community and choose "On My Computer"/"On TradeManager".

2、Export message history of community
Same steps with export Message History with contacts. Please click "Export Message History".

3、Delete message history:
Same steps with delete message history with contacts. Please click "Delete Message History".