You must use the 32-bit build , as 64-bit builds of Thunderbird were not supported for these older versions of Windows.
How can I get the latest version of Thunderbird on Windows XP or Vista? download thunderbird xp
Select your preferred language folder (e.g., en-US for English). Download the file named Thunderbird Setup 52.9.1.exe . How to Install Thunderbird on Windows XP You must use the 32-bit build , as
This version works on Windows XP Service Pack 3 (SP3) . You must use the 32-bit build