I am preparing to transition from an Exchange 2003 to a 2010 server. We only have 1 Exchange 2003 server and the new 2010 server is going to host all roles (except Edge) and run on a Win Server 2008 R2 server. I am updating our Domain Controller to be on a 2008 R2 server also. I've read some upgrade documents suggested on this site and reviewed the MS Deployment Assistant, but I have some questions.
1. My current Primary DNS suffix is xxx.local, but all the mail comes in addressed to mycompany.net. Does that mean I have a 'Disjointed Namespace'?
2. In the Deployment Assistant under 'Configure Disjointed Namespace', it references a document 'Domain Rename Procedure'. It's not telling me to rename the domain is it?
3. I was thinking about getting my certificate before starting the upgrade, but I was concerned that it would 'break' the old one and not allow OWA, ActiveSync, and Outlook Anywhere traffic thru. If I preorder the cert with the same domain name mail.mycompany.net, with other domains on it, will that break the old one? If it does break, could I install the new cert on the old Exchange server if the computer name is not on the new cert?
4. I'm planning on installing on a VMware 4.1 virtual machine. Are there any concerns doing this?
Any other advice?