Working on rebuilding my entire network infrastructure. I recently demoted and removed an old Server 2003 DC. The second got stuck, even with /forceremove and had to be deleted manually. Metadata cleanup was done and all remnants removed from DNS and AD apps. So, I'm left with 5 Server 2012r2 machines, 2 of which are DC's across 2 sites and a Server 2008r2 machine running Exchange 2010.
The final task, for the most part, is raising the DFL and FFL from 2003 to 2012. Couple questions before doing so.
Will it affect Exchange at all?
Should I step through them (ie 2003 - 2008 - 2008r2 - 2012 - 2012r2)?
We don't really use any apps, but do have some things that access AD for auth like Wordpress, Unitrends, Uniflow, Ecopy, etc. Any potential issues with external apps? They are all new versions, so they support higher functional levels.