I have inherited an Active Directory Domain and Exchange Server when I started this job. I want to be rid of both of them and use only linux stuff. I ‘m pretty sure I can just remove the AD server and replace it with smb/radius or smb/kerberos but I want to be able to keep some sort of exchange server compatible mail daemon. They have a bunch of projects that require calandar sharing. Does anyone know of such a beast? And if I remove the AD server and replace it with smb will it kill the exchange server? My guess is yes.