In my existing Exchange 2010 environment (2xMBX, 2xCAS/HUB) I already have external Autodiscover and EWS configured and working.
I now intend to introduce an additional new Exchange 2013 hybrid server.
1. Do I need to publish the name of the hybrid server to Public DNS? Or can I use the existing Public name that is used for external mail services e.g. mail.company.com
2. Do I need a dedicated public IP address only for the hybrid server (as it is responsible for connecting to O365) or a public IP for every Exchange on-premises (CAS/HUB) server?
3. Can I use the existing Autodiscover to form the hybrid relationship between on-premises to O365...or do I need to configure new Autodiscover on the hybrid server, or add the hybrid server to the CAS array?
4. Do I need new certificates or can I use my existing certificates that are used for autodiscover, OWA etc.