[grrowl]

Not "backdoors" but it seems Microsoft stores the BitLocker decryption key, based on this leaked slide (just found on twitter): https://twitter.com/TheBlogPirate/status/471759810644283392/...

edit: Confirmed Microsoft stores your recovery key on their servers if you're not connected to a domain: http://windows.microsoft.com/en-AU/windows-8/bitlocker-recov...

[cradle]

Microsoft storing your key is opt-in and optional.

Whether or not they superstitiously store it anyway is a different question.