Although if I 'sign out' then go to Yahoo Mail it seems to force a login. It all seems very insecure and clunky - I can't quite work out what's happening as Yahoo Mail behaves in a simialr way and I can bypass the login screen by refreshing my browser once I'm 'signed in' via the BT Home page. The link given by Ectophile just takes me straight to my BT Yahoo email (no login screen) as before. I have now bookmarked the Yahoo Mail login screen which seems to work (in an odd kind of way!). How on earth do I sign in as a different user and look at my other emails without going to 'Settings' > 'Accounts' > 'Edit Your Account Info' > 'Manage Sub Accounts' > 'Sign in as a different User' > 'Sign in' > select 'Mail', which seems to be the old BT Yahoo login screen and a long winded method which will doubtless disappear post BT Mail migration. Hit the 'Email' tab and get STRAIGHT back into the account I just signed out of! No option to sign in again as a different user as before. Now I when I hit 'Sign out' I do not get logged out of BT Yahoo mail just pushed back to the BT.com page. I used to be able to log out as one user and log in as the other user to view the other emails (I don't want them merged, one's family stuff the other personal & work stuff). I have two BT Yahoo emails, a and a, under my BT account. Not a problem as I understand BT Yahoo Mail will be migrated to BT Mail. My BT Yahoo email page layout changed today, no warning.

Yahoo mail sign out