PRIVATE MESSAGES: Because this is a free website, with unlimited Private Messages available for all users, large numbers of PMs get sent every day. No problem.
However, over time these become a huge backlog, stretching back over months & months. There are currently more than 400,000 – too many, so this will have to be reduced.
So on December 1st 2020 any messages which are at least three months old will be deleted. I can’t read any individual messages, it will just be an automatic removal of all messages which are dated September 1st 2020 or earlier.
If you are in an ongoing conversation with anyone which began before Sep 1st, it’s probably best to start a new message thread.
Repeat: this deletion will happen on December 1st, not before.