Exchange 2013 and Outlook 2010 Encrypt Messages

I am trying to encrypt outgoing emails.  I am reading that we need a Digital ID to accomplish this but I am a bit confused.
Is this different from a valid SSL certificate on the Exchange Server?

If so, what do I need?  Also, if I need to purchase the Digital ID from a 3rd party, do I need one for each user, or can I buy 1 and share it among the entire Org?
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Scott CSenior EngineerCommented:
Yes, it is different from an SSL certificate.

All SMTP communications between Transport servers are protected by (TLS) encryption

You can disable TLS in come cases with Exchange 2010.

You can find more information here:

You can also use a 3rd party application like PGP to do your encryption.

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