Do you have a question? The error message is quite specific about what you need to do.
Hi Dave,
From the error description, I recommend we firstly check what the currently domain and forest functional are through "Active Directory Domains and Trusts"? And then please follow the below steps to check if the Exchange organization is in a native mode.System manager organization propertiesoperation mode.
Here is a similar case thread for your reference.
Exchange 2010 Readiness Check failed - Organization Prequisites
http://social.technet.microsoft.com/Forums/exchange/en-US/002077a4-5706-4312-a035-6d3a24ec590a/exchange-2010-readiness-check-failed-organization-prequisites
Hope it helps. If there are some problems, please free let me know.
Best regards,
Amy