ITMS 7.1 to ITMS 7.5 Migration

HI

We currently using ITMS 7.1 and now we planning to migrate ITMS 7.5

We currently migrating our AD also.

If we currently using xyz.com domain and now we going to migrate abc.com.

Our ITMS 7.1 is installed on xyz.com domain now we going to migrate both then NS server side what changes we have to do and Client side what changes what we have do.