how to use .asc public key for email encryption w/ outlook 2010

I have a public key from a business partner. its in .asc format. I want to use it to encrypt email messages to/from this reciepient. How and where do I install their .asc key and how do I utilize it in outlook 2010 etc etc ?

thxs
DEFclubAsked:
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pand0ra_usaConnect With a Mentor Commented:
You need a plugin or another application to install an .asc file. Outlook only accepts PKCS type files. Gnupg will do the trick. And like ve3ofa said you need to send the recipient your public key as well.

http://www.gnupg.org/
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DEFclubAuthor Commented:
It looks to me the public Key that was sent to me as a .asc attachement is from the senders PGP system. How can i make use of their PGP public key (.asc) in outlook 2010 / exchange 2010 ??
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David Johnson, CD, MVPConnect With a Mentor OwnerCommented:
you will have to also install pgp create a private key, and then send that user your public key.
Now you 2 can encrypt mail back and forth.  Depending upon which version of pgp you install you may or may not be able to encrypt within outlook.
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DEFclubAuthor Commented:
thxs
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TMark24Commented:
With the public key you can only send encrypted mails to your business partner.
When you create your own key pair (keep the private, publish the public one) someone else will be able to send encrypted mails to you.

You can do the enryption / decryption outside Outlook with gpg4win. But this is a very unhandy, to everything over the clipboard.

Much easier is plugin solution. With Outlook 2010 works gpg4o (www.gpg4o.com) very good.
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