i do have exchange 2007 with os 2003 connected to primary domain controller 2003 with additional domain controller 2008 for some reason domain controller 2003 stopped working so we removed it from network, exchange serer 2007 give me a massage that canno

i do have exchange 2007 with os 2003 connected to  primary domain controller 2003 with additional domain controller 2008 for some reason domain controller 2003 stopped working so we removed it from network, exchange serer 2007 give me a massage that cannot find domain controller which has scheme master role  what should i do to make it work with domain controller 2008

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heba