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#11
It does and it says "To get the digital ID of the sender, ask the sender to provide it to you."
For sending mail: Get or create your own digital signature - Excel - Microsoft Office
(I'm guessing that it may be possible to purchase the Digital ID and use it with any mail program that allows its use, but to be sure I'd go to the Office Marketplace and search for more info there.)
"If you select the option Get a digital ID from a Microsoft partner in the Get a Digital ID dialog box, you are redirected to the Microsoft Office Marketplace, where you can purchase a digital certificate from one of the third-party certificate authorities (CAs) with an Office Marketplace listing.
If you plan to exchange digitally signed documents with other people, and you want the recipients of your documents to be able to verify the authenticity of your digital signature, it is a good idea to obtain a digital certificate from a reputable third-party certificate authority (CA)."
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