I've been using Thunderbird (TB) for ages now and never changed the settings so I'm still using POP to get my emails. I only had 1 PC for the emails but now I've got Gmail on my phone and tablet do I need to change to IMAP? However, what I don't want to happen is that if I read and delete an email from my phone/tablet that it wont download onto my PC with TB when I open it.