Need trick n' tips regarding encryptions software for mail sending

Need trick n' tips regarding encryptions software for mail sending
We have a Exchange 2007 enviroment, some users uses Outlook 2007 and OWA.
Others users uses somthing called pine or Thinderbird.

When it comes to Outlook and OWA 2007, how is it possible to encrypt e-mails from these clients?
How do you install it, is it possible to install directly on a server that distrubute the encryption clients?

Regarding pine and Thunderbird you can install a client on that software, but you have to do it manually, is it possible to simplify this when using an Exchange 2007 server?
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GMH77Author Commented:
Thx guys, please update this if you have anything more to add :)
But the things you wrote solves my question :)
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