For comments on this question, I followed the link suggestion to continue the conversation in chat. Now the conversation has vanished leaving a dead link. Is this normal (i.e. continuing in chat should only be used for temporary short-lived discussions), and if so, how long will the chats remain?
From the Chat FAQ:
Will these rooms exist forever?
Rooms will exist indefinitely, so long as there is at least one person actively talking in the room. A room is considered worth retaining if it has more than 15 messages by at least 2 users.
Rooms not worth retaining which are inactive for 7 days will be deleted. Rooms worth retaining which are inactive for 14 days will be frozen. Frozen rooms do not allow any new messages to be sent, and are not shown in the default room list to prevent cluttering the rooms interface.
Looks like you and barbara beeton exchanged only 9 messages in that room, so it was deleted for inactivity 48 days ago.