new DC is added and it will be the PDC. The DC has also the DNS role so my question is what change should we need to do on our Exchange server. Change DNS on network card is it enough or there are more thing I should do. Thank you.

Hi,If the existing DNS servers are not removed you don't need to do anything. If one or these is removed and you want to use the new DC as primary DNS server you just change this on both CCR servers and you should be fine.Leif

Hi ,I think if it is the additional domain controller that you will not need special for more configuration on exchange just change the dns priority according to your requirement and if it is also a gc then exchange automatically sync it as a GC server which is quite useful for exchange server 2007.Main function : May be this is an important aspect realted to emails .the PDC Emulator is the root time server for synchronizing the clocks of all Windows computers in your forest. It's critically important that computer clocks are synchronized across your forest because if they're out by too much then Kerberos authentication can fail and users won't be able to log on to the networkRegardsSyedsyed.arsalan