I've never heard of this -- I've just tried googling and I can't find anything about automatically deleted, or even created, "Users.old" folder (I realise you m

I've never heard of this -- I've just tried googling and I can't find anything about automatically deleted, or even created, "Users.old" folder (I realise you might not have got the name exactly right). Sometimes individual user directories get moved if they are corrupted, but they still aren't in my experience deleted.