I use Gmail.
As a user of .Mac/MobileMe mail (@mac.com;@me.com) on my iMac, I now am unwilling to change my OS to Lion or my mail system to iCloud because both add unneeded complexity (and probable trouble) for my usage. I really enjoy using Firefox, so I would like to try theThunderbird mail system and completely sever my ties to any Mac mail system. Is this possible? My understanding of Thunderbird is that it, as a client system, requires an ISP - provided mail system which is not attractive to me as I am also changing my ISP soon. How might I achieve my objectives? Thanks!

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