My organization is running exchange 2013 and current DFL of 2003. The DC's are 2012 with the exception of 1 GC that was left at 2003.(oversight) I would like to decommission that one, replace with another 2012 DC and raise my function level to at least 2008R2 but preferably 2012. Could this cause any issues with the existing exchange servers? Any other concerns? Pretty wary of breaking something. Hoping this will resolve some of the quirky issues that older migrated accounts are seeing.
Thanks
