Gmail in Multiple Clients
Gmail has always confused me that when opening POP emails from multiple clients, only those opened in that client show up. In other words, if you open up an email using client A, you can’t open it in client B — you have to view it in webmail.
Of course, there’s a workaround, provided in the help centre. The solution is to use your login as
recent:firstname.lastname@example.org, rather than the usual
email@example.com. This is apparently automatic on mobile devices, but I don’t see why it’s not the default…