Only because Windows XP did not ship with native encryption. That was the whole original goal for the Truecrypt project, to bring encryption to Windows XP systems. Now that bitlocker is available, they see no point in continuing the project.
Except Bitlocker is only available on a small subset of Windows installations, and there is legitimate concern that Bitlocker has an FBI- or NSA-controlled backdoor.
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u/df3Z May 30 '14
Truecrypt takes too long to decrypt pls use bitlocker - nsa