We currently have an Exchange 2013 Hybrid server along with a DirSync VM that syncs our AD with Office 365. The domain functional level is 2003. I just installed a pair of 2012R2 DCs and I'm ready to remove AD from the 2003 DCs and upgrade the DFL to 2012R2.
In regard to raising DFL and decommissioning the old DCs, are there any known issues or configuration changes required for either the Exchange 2013 server or the Dirsync server? Of course we need to change IP configuration so the Exchange and Dirsync
servers have the IP address of the new DNS server. But I'm wondering if there's anything else in the server config that points to a particular DC, or will have trouble with the DFL upgrade. Any guidance here would be appreciated.