For the incoming server I use "pop.telstra.com" and for the outgoing server I use "smtp.telstra.com". It would not accept the incoming server name and said that it already exist i.e. "pop.bigpond.com". 
  At this point in time I am very confused and about to give up using "Thunderbird". I got even more confused when I searched the F.A.Q. Since I cannot get headway with "Thunderbird", I think I will stop my monthly donations.

Tried entering password for "ahkwong@bigpond.com" and primary password and unable to log in. I am having a lot o problems trying to set up an account and kept getting error after error. Both the passwords are correct. For the incoming server I use "pop.telstra.com" and for the outgoing server I use "smtp.telstra.com". It would not accept the incoming server name and said that it already exist i.e. "pop.bigpond.com". At this point in time I am very confused and about to give up using "Thunderbird". I got even more confused when I searched the F.A.Q. Since I cannot get headway with "Thunderbird", I think I will stop my monthly donations.