I'm trying to install Exchange 2007 into an existing Forest with Exchange 2003. I used setup /PrepareLegacyExchangePermissions and setup /PrepareSchema and setup /PrepareAD but the install of HUB-server role already stops with errors. I'm getting the following event entry: source: MSExchangeADAccess eventid: 2155 Prozess edgetransport.exe (PID=2036).error reading configurationsobject CN=Test,CN=Internet Message Formats,CN=Global Settings,CN=Schulung,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=schulung,DC=ads in trainer.schulung.ads.A DataValidationException has happend. Help welcome fgclodt

in the meantime I found a workaround - I simply deleted the object from AD ( it was a self-defined internet-message-format for Exchange 2003 global settings) and Exchange 2007 installed completely without errors. fgclodt