Funny bug in yahoo mail: first with 0 unread message in the page title, one of the messages was not really read (that is, displayed in bold). After I read it, I got a -1 (!) Unread message.
On this occasion, I immediately recalled a recent joke : - Why do you call this version of software 'beta'? - Coz it's beta than nothing. ')
ps I don’t need to tell anything about gmail. I started the box on yahoo in order to broaden my horizons.