Currently we do not store chat history on our service. Only messages for offline users are stored and only something like 100 of them max and only until the user logs in, and when all the messages are delivered to the user, they are deleted from our database.

At the moment MUC component can preserve multi-user-chat room history and this is a configurable option for each room. Once created the MUC stores chat history indefinitely.

We plan to add per user chat history stored in our database, but this will be on per-user basis optional feature with default set to off.