YourcompanyhasaWindowsServer2003ActiveDirectoryforestthatcontainsasingledomain.Thefunction
A.SetthefunctionalleveloftheforesttoWindowsServer2003.
B.PreparethelegacyExchangepermissionsfromtheExchangeServer2010installationsourcefiles.
C.AddtheExchangeServer2010schemaextensionsbyusingtheExchangeServer2010installation sourcefiles.
D.UpgradealldomaincontrollerstoWindowsServer2008,andthensetthefunctionallevelofthe domain toWindowsServer2008.