During the Monday night sent Apple out the sharp version of IOS 11.4.1 to the public after a period of betatestande.

this is the news that is mentioned in the accompanying documentation:

Fixes an issue that made some users could not see the last known location for their Airpod devices in Find my iPhone.

Improves the reliability of the synchronization of email, contacts, and notes with Exchange accounts.

As usual, you can download the new IOS version via the built-in update feature in your Iphone, Ipad or Ipod Touch.

Finally, Apple have also sent out the sharp versions of the SCREEN OS 11.4.1 and Watch OS 4.3.2, although it is only a matter of bug - and security fixes.

The text above is a summary, you can read full article here.