Clarifying terminology: MAPI vs RPC/HTTPS vs Outlook Anywhere
Solution 1:
outlook anywhere is RPC over HTTP - it's just a name change. Outlook anywhere's auto configuration is an outlook 2010 ability. Older clients can still use outlook anywhere but must be manually configured. An additional feature (under the outlook anywhere umbrella) is client redirection, which you would set up if you wanted to use SSL or a specific CAS server for a client or group of clients that were not domain joined.