I have a network with 250 users, all on one Exchange 2003 server, and AD 2003.
I want to purchase new hardware and upgrade our AD to 2012 and Exchange to 2013. I realize the Exchange portion cannot be updated directly and bumping to Exchange 2010 is the preferred method. I'm unsure of the steps for upgrading AD to 2012.
Can I install 2012 server on our new boxes and upgrade AD to 2008 native mode, then install Exch 2010 on an interim server and migrate our Exchange environment over? I would run this way for a few weeks, then update AD to 2012 mode and install Exchange 2013 on a new server, and migrate the mailboxes again.
Does this solution make sense? I assume the best method would be to have two separate servers for Exchange, one as a temp 2010 box and one for the final 2013 installation? Can I start with Windows 2012 server, or do I need to install Windows 2008 server first and also migrate my AD?
Any suggestions and guidelines would be appreciated.