I would like to prevent Outlook 2010 and 2013 clients from connecting if RPC encryption is disabled/unchecked. I'm using a Exchange 2010 server and I've configured a setting that should accomplish this (unless I'm missing something).
Set‐MailboxServer <ServerName> ‐MapiEncryptionRequired:$true
I've also check the following command and "EncryptionRequired" is set to true.
Get‐RpcClientAccess | fl Server,EncryptionRequired
However, when I run Outlook with the RPC encryption feature unchecked, I'm still able to connect to the exchange server, and send messages. One thing I noticed is the address book is no longer works, so I think I'm on the right track. Is there anything I'm missing? Thank you for your time.