Exchange 2016 Troubleshooting: EventID 642 (ESE)
While Exchange 2016 is still "New", there are some warnings or errors you may encounter but they are not actually a problem on the server. Let's look at the example below:
https://collaborationpro.com/wp-content/uploads/2017/06/evenitID-642.png
You might think the above warning is telling you something is wrong with the database. Actually, it's more informational. While it will log this event on your server, you can safely ignore it. Hopefully once the new features for the ESE are released these warnings will go away.