Long time PC user here that just obtained my first Mac. Loving it!!! One problem I'm having is trying to figure out how to shut down Thunderbird completely so that it doesn't receive mail. I use my laptop exclusively for receiving and sending mail. I would only use the mac (Thunderbird ) occasionally. As it stands now; when I shut down Thunderbird it still receives mail in the background. Would like to remove Thunderbird from memory to prevent that!