I was using 2003 domain controller but I was told to upgrade to 2008 so I upgraded one DC to server 2008. I built a new server for exchange to migrate from Exchange 2003 to 2007. I installed windows server 2008 enterprise edition. Certificate authority server is still 2003 but when I try to create a new certificate for Exchange 2007 but it failed to work. I got support from Microsoft and the advisor installed CA authority on exchange 2007 server. I am really confused now I have got two CA servers. Is it possible to have 2 CA in a domain.(There is other sub domain or child domain).
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