I am in the middle of migrating an old SBS2003 box to a new physical box running Server 2012 R2 as a hyper-V host with several Server 2012 R2 VMs. As part of the process I have to migrate Exchange 2003 to Exchange 2013. I understand that this is not possible in a single jump without 3rd party software. I have installed a VM running Server 2008R2 and Exch2010. I have been following this tutuorial;
I am into part III, up to the Split-Brain DNS section part 14, and it tells me this:
"First though we need to open some ports on our firewall. For coexistence we will need two public IPs.
Our first public IP will continue to point to our Exchange 2003 server.
Our second public IP will point to our Exchange 2010 server.
We need to open ports 80 (HTTP) and 443 (HTTPS) to our Exchange 2010 server.
This process will vary based on the firewall you have."
This raises somequestions for me:
1. By 'Public IP' I am assuming we are talking about the external IP address that is provided by our ISP; the same one that we get when we go to http://www.whatsmyip.org/
2. If this is the case do I need to contact our ISP to get them to provide a second one?
3. Do I even need co-existence beyond the time it takes to migrate from Exch2003 to Exch2010? If I do this out of hours there will be minimal impact on users, so I am happy to take the Exchange server offline to do the migration. Can't I just get Exch 2010 up and running, migrate the data, turn off Exch 2003 and let Exch 2010 take over?
I was hoping to get this done this weekend, but now it's Sunday afternoon and it is looking less promising...:(