> Again, I realize that most users don't know to encrypt %temp%
> or their page file, but again, for a more savvy user, wouldn't
> EFS provide a pretty high level of security for data at rest?

Don't forget exception modes, even for "savvy" users.  People,
for the most part, know that they should take steps to secure
their data, but it's difficult to do manually.

For example, would you want your enterprise to rely upon manual
*backups*?  Savvy sysadmins would know that they had to run the
backups on the appropriate day, archive the media properly, etc.
  Bet you dollars to donuts that when the day comes that you need
to restore something from tape, you discover that performing
backups just kept drifting down the priority list...

With paranoid enough users, there's plenty of solutions out there
(you don't even need to use an encrypting *file system*, just
pgp-encrypt the appropriate files, for example, and you can get
rid of the page file entirely by just adding more RAM to a
machine).  The problem is, for almost all groups of users
(including groups of 1), there's members of the group who aren't
paranoid enough.
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