Hi,
I have three Exchange 2003 Servers. One of them is back-end for few databases and SMTP connection. The second Exchange 2003 is back-end for another few databases. The third Exchange 2003 is front-end for OWA. I have setup two Windows 2008 Servers. One will be for mailbox role and other will be CAL and Hub Role. I have installed all the prerequisite, domain preps, and all.
My question is to install Exchange 2010, should I install for mailbox role first or the CAL & Hub Role? Or it really doesn't matter?
Also once I implement the Exchange 2010, I will move my mailboxes to Exchange 2010. I was also plan to deploy Exchange 2013 and then move mailboxes from Exchange 2010 to Exchange 2013. Can I do this while Exchange 2003 is still around till I move all the mailboxes from 2003 to 2010, then to 2013 till I decommission the 2003?
Thanks in advance.