You can encrypt email using S/MIME if you have a BES!
And you can do full certificate synchronization with the desktop, as well.
Even though the email is encrypted to the handset, that isn't good enough Dawg et al - having the ability to digital sign or encrypt a message to receipients outside of your own organization is important to many corporate IT departments.
I have no idea what "blackberry encrypt v.1.01" is, but it sounds like snake oil so far
Far better to use PGP or S/MIME to handle encrypted or signed email, and with the BBerry your only option is S/MIME.