I have had a btclick account since God was a boy and I know about the recent email changes and have dealt with that.
I get my emails in Outlook but I have just tried to log in to my account using the link saved in my browser and I apparently no longer exist.
Were all of the old free btclick accounts wiped out? If so then some notice would have been good : if not how can I log in ?
I guess it's true that there's no such thing as a free lunch!
BTClick became BTConnect ... so go to te BTConnect portal on Office 365 and login using the original name substituting Connect for Click and the original password.