Vista - Digitally signing and encypting email in Windows Mail

I have loaded a Thawte certificate and have no idea how to use it now.
Importing it to my email addy in the address book under ID shows that it is
there but when sending an email it gives the error "The message could not be
sent, An error has occured" and if I try then also choose the Encrypt option
it gives the error "Windows Mail was unable to locate the digital IDs of the
following recipients:" So how does one use a certificate once it has been
received to digitally sign and Encrypt emails.

I'm having the exact same problem with my Thawte certificate.
I thought I understood the system, but I tried firefox/thunderbird on my
home PC and MSIE/Windows mail on my laptop and nothing works as I expected.

Does Microsoft monitor this forum to help anyone?

"Shore" wrote:

This is strictly a peer to peer support group, no Microsoft presence.
Unfortunately, we have no security certificate experts here, so you would
have to find a support group for that elsewhere.

--
Gary VanderMolen, MS-MVP (Mail)


"Michael" <Michael@xxxxxx> wrote in message news:7B8A6255-A886-4AEF-9EE5-FF5501DBBAFA@xxxxxx

"Shore" wrote:

You use your digital certificate to sign emails, not to encrypt them... you
encrypt using the recipient's public certificate, not yours. You need to
import the public certificate belonging to the person you wish to encrypt
for, and associate it with that person's contact entry. By signing the
email, you give the recipient a copy of your public certificate, so they can
encrypt back to you.

"Shore" wrote: