i am trying to upgrade from exchange 2007 to 2012. in the prerequisites it says i cannot go any further unless exchange 2000 or 2003 servers are removed. ive located the old 2003 server in adsi but im not sure if i should delete it or what would happen if i delete it. i was told that it needed to be left there when migrating from 2003 to 2007, but i have no clue why. can someone shed some light on why that was the case and what would happen if i go ahead and get rid of it? is there some sort of work around? am i even looking in the right place?
The following is for 2010 although most of it applies to 2010 https://www.simple-talk.com/sysadmin/exchange/upgrade-exchange-2003-to-exchange-2010---part-ii/