How to install Thunderbird3

[Mani]

Hi,
I am new to Ubuntu(Just installed and trying to locate software). And 
this is the first time I am working (with a serious intent) on Linux. I 
am not able to find new releases of Netbeans and Thunderbird in the 
UBuntu Software center or the Synaptic package manager. Does it take 
some time for new versions of software or new software to appear in 
these centers?

PS: I am already in love with the Ubuntu Desktop.

Cheers
-- 
*Mani/Naren/Iyer*
/The secret of walking on water is knowing where the stones are/
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