Very few of my current contacts have Microsoft Office, so this isn't really an option. Most end-users don't get MS-Office on their home PCs.
Then there is the question as to whether anyone should propagate the use of $300-$500 proprietary software just to read email?
Yesterday, I discovered a new TWiT show ... "Know How ..." http://twit.tv/kh They did an episode about setting up GPG with Thunderbird and Enigmail. Also showed a browser-only option using some plugin for Firefox and Chrome (don't know if Chromium works). I'm not a fan of browser plugins for gpg - seems like a deck of cards from a security standpoint. The demonstrators seemed a little less knowledgeable about security than I would have liked too. To the point that I'm not certain about the security of their installs. Anyway, it was an interesting show even if they left out gpg key signing and uploading our public keys to key servers completely.
Again, sorry this isn't about Evolution.
LATE UPDATE:
http://lifehacker.com/how-to-encrypt...s-p-1133495744 explains installation for GPG, enigmail, thunderbird and keys.
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