I've just been going through the BitLocker FAQ (http://technet.microsoft.com/en-us/library/ee449438(WS.10).aspx). To offer the appropriate level of protection, whole disk encryption with pre-boot authentication needs to be used. Having read the FAQ, unless I'm mistaken, BitLocker does not seems to support multi user pre-boot authentication unless USB flash drives are used to store "startup keys". Please can you clarify that this is the case? David Nudelman MVP: Windows Expert - IT Pro MCSE, MCTS: Vista, Windows 7, Exchange 2007 MCITP: Windows Server 2008 Web: http://geeks.ms/blogs/dnudelman

If you are talking about pre-boot authentication, you can use TPM+PIN as protector, but the PIN has to be shared between all the users who will use that machine. PIN is a numeric number and PIN length can be configured using the GPO. If you are already using TPM as a protector you can change the protector to TPM + PIN by using manage-bde command. I hope this helps.Manoj Sehgal

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