Any Native Clients that support Exchange
 

I'm looking for a Native opensource application that support Exchange server MAPI, public calendars etc.. I've tried Evolution, and the Mapi has authication issues.

Anything else out there that is stable and works as well as outlook?

If it's an auth issue, are you sure it's not Microsoft's half-baked kerberos/ldap-like implementation?

With Exchange you got in for a penny and now you are paying pounds. Or something like that...