That is actually the first thing I did when I read the original post. Seems to work exactly the same for email purposes at least and everyone I sent mail to was able to decrypt etc. I also found the getting the cert process much easier. I didn't have to create an account and the email saying my cert was ready only took about 1 minute, I think i've waited close to 15 minutes for thawte certs in the past.
Hopefully they don't follow the same fate at thawte did.