I've already ran all the pre-requisites and have everything ready to go but the hardware, which should arrive today or tomorrow. Super simple setup, single AD forest and domain. Our internal domain name is the same as our external (mycompany.com). I've read and re-read the transition steps 20 times already, they seem fairly straightforward, however the one thing that worries me, and that NEEDS to work without any interruption is ActiveSync for mobile devices. Currently all my mobile devices (iPhones) use ActiveSync to connect to mail.mycompany.com. I also have a VeriSign SSL certificate for that.
1.) Do I need to purchase ANOTHER SSL certificate for the new Exchange 2010 server to have them coexisting without issue?
2.) Once I bring this new Exchange 2010 server online and point to mail.mycompany.com during the Exchange install/setup, will all outside and/or mobile clients lose connectivity?