I need a clarification on the following
I have the following servers 2 Exchange 2013
1. One Exchange 2013 CU4 i.e. SP1 – CAS & MB – 2 mail stores with enough storage
2. Second Exchange Server 2013 CU9 - CAS & MB – 2 mail stores with enough storage
Tried creating a DAG of the two server the second server is not attaching itself to the DAG throughing an error.