I currently have one domain that is a 2003 functional level with 3 x Windows Server 2008 servers (Web Server, Database Server/DC and File Server) for our main office and one Windows 2003 server in our Tucson office. The original domain had a 2000 server so it was originally 2000 mixed functional level but I updated it to 2003 before installing the 2008 servers.
The problem is that I am building a brand new server to replace the old Windows Server 2003 server in Tucson because of the end-of-life thing. I am trying to install Windows Server 2012 but it failed the validation because the Forest is still set to 2000 mixed. I am going to update the Forest after hours tonight but I was wondering if there are any pitfalls I need to look out for before I do it?
Thanks for any input.