Bookmark & Unread
You can bookmark the conversations to help you manage and sort out your contacts better, so you will never miss a message.
Bookmark a conversation so that you will not miss the important contacts' conversations.
Click the arrow button next to the conversation, you can choose "Bookmark" a conversation.
To remove the bookmark, press the user options, and choose "Remove Bookmark". The conversation will not be shown on the top of the conversation module and will be listed according to the time of the last message sent or received.
By pressing the "Mark as Unread" button, you can change the read conversations to unread to follow up later.