Exchange Information Store

Thank you all,

For your valuble time and your expertise.

The issue has been solved.

The problem is giving an entry in Distributed applications under Host Properties of Master Server.

Here are the steps followed.

1. Configure the Master Server\Host Properties\Distributed Application with below entries
    DAG and Mailbox server
    DAG and CAS node

2.Edit the HOST files on the Master Server, Exchange 2010 mailbox node and CAS NODE as instructed.

     ipaddress              hostname            FQDN
     192.x.x.1               master                master.nbu.com
     192.x.x.2               mailbox1             mailbox1.nbu.com
     192.x.x.3               cas1                   cas1.nbu.com
     192.x.x.4               dag                     dag.nbu.comUse complete FQDN.