Exchange 2007 and Exchange 2013

I currently have an SBS 2008 server running and we have just added a new 2012 Server which is currently running as a secondary domain controller at the moment. We have another new server that we are going to put Exchange 2013 on and use the CodeTwo software to migrate mailboxes, Public Folders etc. from the SBS box. My question is that once we upgrade the SBS 2007 exchange server to SP3 can we just install the new Exchange 2013 server on the same domain without any issues and they will happily co-exist until we are ready to run the migration software?
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Short answer, yes, they will happily co-exist.

However, once you start moving mailboxes (unless you are planning to do a one and done migration [migrate everything from 2007 to 2013 in one fell swoop]) you will need to ensure that both the 2007 and 2013 Exchange servers are publicly accessible (the 2013 server would be accessible as the primary server; e.g. - and then send targeted requests to the 2007 server using the record).

If you are planning on doing a one and done migration then there is no need to worry about making the 2007 Exchange server publicly accessible.


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Simon Butler (Sembee)ConsultantCommented:
If you are planning to put the new server in the same domain, then you don't need the CodeTwo software. That is for cross forest migrations. Same domain migrations can all be done with native tools. For coexistence you will need two external IP addresses and host names for the two versions of Exchange, but unless you have overloaded the Exchange server I would be planning to move everything over a weekend.

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