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In previous versions of Windows, you had the choice of opting to have updates installed automatically or installing them yourself, or not installing them at all. But for Windows 10, Microsoft made the decision to force updates on users, so each update is going to install whether you want it or not.
In a case such as that, you can use the cmdlet to force the user database to refresh its contents by re-reading all of the user information stored in Active Directory.
You might also need to run this cmdlet if a product update ever includes a change to the user replicator service.
More often than not, the automatic synch between the user database and Active Directory will keep the information in the user database up to date.
However, it is possible that a problem might occur that prevents this automatic synchronization from taking place.