We just started using smartcards and encrypting emails. I have Windows 7 Enterprise x64 with all the latest updates, and running Outlook 2010.
When I go into trust center and then "email security", and then the settings for my encrypted email and check available encryption options, all I see under email security are :
3DES
DES
RC2 (128bit)
RC2 (64bit)
RC2 (40bit)
That's it! No AES anywhere!!
If anyone can help, I would much appreciate it.