I am now responsible for a very old 2003 environment with 2003 AD, 2003 Exchange and several 2003 servers. I would like to do long term upgrade to AD2016 and on premises Exchange 2016. Can the AD upgrade go directly to AD2016 (via additional new servers) and then a new Exchange 2016 server while still support existing 2003/2008/2012 servers with Win 7 end user devices ? Would like to preserve existing domains (two) and upgrade the AD to 2016 first and then do an inplace/onsite migration from Exchange 2003 to Exchange 2016.
Lastly, there are still some Windows XP machines - I assume they must go ??