UCA should locate the data if it is all within the same Active Directory Forest. If it's a separate forest you would need to create additional data sources for each forest. Are you having a particular issue with a child domain not being collected? Did you specify the target mailboxes which includes that child domain?
UCA should locate the data if it is all within the same Active Directory Forest. If it's a separate forest you would need to create additional data sources for each forest. Are you having a particular issue with a child domain not being collected? Did you specify the target mailboxes which includes that child domain?