I currently use Thunderbird with a BT email address. My ISP is Sky. If I go onto Gmail and change my address to a Gmail one, presumably I have to use the Sky server. This means that I no longer will have access to the BTYahoo list of past emails. So I must backup my Thunderbird to make sure I don't lose them. Is this correct? (PS I'm on a learning curve here, with emails.)
I want to drop the BT address because BT want to charge me £5 a month to use it as I'm not a customer any more. I presume when I cancel them I will lose all the emails on its sever?