Exchange Email Encryption Email Encryption: Any Recommendations?

Email Encryption: Any recommendations? - exchange email encryption

I am currently designing a new network for a customer and demanded the addition of an e-mail encryption standard. But like most companies these days who do not want to spend a huge sum of money. The network consists of a Windows Small Business Server 2003 with Exchange Server 2003 e-mail. The mail client is Outlook 2003. My client wants to be able to network unencrypted by e-mail to multiple recipients. I need a simple solution, because they have no firm IT staff on site to have, so we need a solution that can manage themselves. I had a look at PGP, which is the best solution because it would automate the process of encryption, but the license is very expensive per seat. We could use a certificate with Exchange, but even here there is a problem of management. I wonder if anyone has found a simple and effective method of encryption that can be used with e-mail. If anyone has any comments I would be grateful.