It’s that time of the year for another Exchange 2013 CU upgrade. Usually the first part of the upgrade process is to check to see if you need to extend the AD schema etc. Before I extend the schema I always check AD replication using the command line tools. This time however, I found a really awesome GUI tool that simplifies this process.
Active Directory Replication Status Tool
Run the tool and refresh replication status before and after each step in the process. The tool also has really cool error guide that links directly to Microsoft support articles for replication issues. Enjoy!